WASHINGTON — The battle in Ukraine has prompted the most important rethinking of American international coverage because the Sept. 11, 2001, assaults, infusing the USA with a brand new sense of mission and altering its strategic calculus with allies and adversaries alike.

The Russian invasion has bonded America to Europe extra tightly than at any time because the Chilly Warfare and deepened U.S. ties with Asian allies, whereas forcing a reassessment of rivals like China, Iran and Venezuela.

And it has re-energized Washington’s management function within the democratic world simply months after the chaotic U.S. withdrawal from Afghanistan ended 20 years of battle on a dismal observe.

However the brand new give attention to Russia will include laborious selections and inner contradictions, just like ones that outlined U.S. diplomacy throughout the Chilly Warfare, when America generally ignored human rights abuses and propped up dictators within the identify of the battle in opposition to communism.

“It looks like we’re definitively in a brand new period,” mentioned Benjamin J. Rhodes, a former deputy nationwide safety adviser within the Obama White Home. “The post-9/11 battle on terror interval of American hubris, and decline, is now behind us. And we’re unsure what’s subsequent.”

The assault by President Vladimir V. Putin of Russia on his neighbor has change into a prism by which almost all American international coverage choices can be forged for the foreseeable future, specialists and officers mentioned.

In current weeks, Western officers have spoken in phrases that usually echo the grand declarations that adopted the 2001 terrorist assaults. On Friday, President Biden mentioned that “the free world is coming collectively” to face as much as Mr. Putin — a phrase harking back to President George W. Bush’s discuss of how “your entire free world” was at battle in opposition to terrorism.

Within the close to time period, Russia’s aggression is bound to invigorate Mr. Biden’s international combat for democracy in opposition to autocracies like Moscow, making vivid the threats to fledgling democracies like Ukraine. But three more and more authoritarian NATO nations — Poland, Hungary and Turkey — play key roles within the coalition aiding Kyiv. And the USA is grappling with inner assaults to its personal democracy.

The battle lends urgency to Mr. Biden’s local weather change agenda, reinforcing the necessity for extra reliance on renewable clear vitality over the fossil fuels that fill Russian coffers. But it has already generated new stress to extend the short-term provide of oil from the likes of Venezuela’s remoted dictatorship and Saudi Arabia’s authoritarian monarchy.

And it creates a robust new incentive for the USA to search out methods of prying President Xi Jinping of China away from Mr. Putin, who is probably going relying on diplomatic and financial lifelines from Mr. Xi amid crushing Western sanctions. However some administration officers see China as a misplaced trigger and like to deal with China and Russia as dedicated companions, hoping which may provoke insurance policies amongst Asian and European allies to include them each.

Whereas some specialists warn {that a} renewed give attention to Europe will inevitably divert consideration from Asia, a number of prime White Home officers say the USA can capitalize on how the battle has satisfied some Asian governments that they should work extra carefully with the West to construct up a worldwide ideological entrance to defend democracy.

“What we’re seeing now’s an unprecedented degree of Asian curiosity and focus,” Kurt M. Campbell, the highest White Home official on Asia coverage, mentioned at a chat hosted by the German Marshall Fund of the USA.

“And I imagine one of many outcomes of this tragedy can be a sort of new pondering round how one can solidify institutional connections past what we’ve already seen between Europe and the Pacific,” he mentioned.

America’s strategy to the world was already present process a serious shift, with the U.S. wars in Afghanistan and Iraq concluded, and conversations over Islamist terrorism not on the fore. Many war-weary People welcomed requires a diminished navy footprint abroad by President Donald J. Trump, who questioned NATO’s relevance and even flirted with withdrawing from the alliance.

Mr. Biden sought to rebuild American alliances, however did so largely within the identify of confronting China. The Russian invasion has expanded his mission dramatically and urgently, setting the stage for a seismic geopolitical shift that might pit the USA and its allies in opposition to China and Russia directly in the event that they kind an entrenched anti-Western bloc.

But it surely additionally offers Washington a brand new and nobler sense of goal, Mr. Rhodes mentioned. “We’ve been attempting to get to a brand new period for a very long time,” he mentioned. “And now I feel Putin’s invasion has necessitated an American return to the ethical excessive floor.”

Enjoying Hardball Over Power

Early indicators of how the brand new American priorities are creating diplomatic quakes have already emerged.

On Friday, the USA and its European allies agreed to pause talks with Iran that simply days earlier appeared on the verge of clinching a return to the 2015 deal that restricted Iran’s nuclear program. Western nations are refusing a requirement by Moscow, which is a celebration to the Obama-era settlement from which Mr. Trump withdrew, for ensures that its future transactions with Iran be exempted from the sanctions imposed on Russia in current weeks.

“It’s been clear since final weekend that negotiations to revive the Iran deal couldn’t be walled off from the Ukraine battle,” Dalia Dassa Kaye, an Iran skilled on the RAND Company, mentioned on Friday.

Final 12 months, Mr. Biden made a brand new settlement a core aim of his international coverage. It’s unclear whether or not one might be struck with out Russia, which is a member of the fee that each supervises compliance with the deal and would take management of Iran’s extra enriched uranium.

The US can also be Venezuela from a unique approach. Senior Biden administration officers traveled to Venezuela two weeks after the Russian invasion, changing into the primary to go to the nation in years. Venezuela, a companion of Russia, is underneath heavy U.S. sanctions imposed years in the past to weaken the repressive authorities of President Nicolás Maduro. In 2019, the Trump administration imposed extra sanctions on the state oil firm, central financial institution and senior officers to stress Mr. Maduro to step down.

Now, with Mr. Biden seeking to improve international oil provides to convey down costs, U.S. officers are speaking to Mr. Maduro’s authorities about shopping for his oil once more. The concept has drawn some sharp criticism in Congress, nonetheless, the place Senator Bob Menendez, Democrat of New Jersey and the chairman of the Senate International Relations Committee, fumed that “efforts to unify your entire world in opposition to a murderous tyrant in Moscow shouldn’t be undercut by propping up a dictator underneath investigation for crimes in opposition to humanity in Caracas.”

The identical crucial on oil is reshaping U.S. diplomacy with Saudi Arabia and the United Arab Emirates, two Persian Gulf nations that some Biden administration officers view with suspicion or hostility due to their autocratic techniques and main roles in a battle in Yemen that has resulted in a humanitarian disaster. Brett McGurk and Amos J. Hochstein, two senior administration officers, traveled to the Gulf days earlier than the Russian invasion to debate safety and vitality points.

Nonetheless, Saudi Arabia has declined to this point to extend oil manufacturing, whereas the United Arab Emirates waited till Wednesday to ask the OPEC nations to take action. American officers have been additionally livid with the U.A.E. for declining to vote on a United Nations Safety Council decision to sentence Russia, although it did help an identical decision later within the U.N. Normal Meeting.

The unreliability of the 2 nations and Russia’s place within the oil financial system have elevated momentum throughout the Biden administration to enact insurance policies that might assist the USA extra rapidly wean itself off fossil fuels and confront the local weather disaster. This might lead future administrations to commit fewer diplomatic and navy sources to the Gulf nations in the long run, even when U.S. officers need them to assist on oil now.

“We may even see extra elementary questioning in regards to the worth of those partnerships,” Ms. Kaye mentioned. “These states already imagine the U.S. has checked out of the area, however their stance on Russia might solely strengthen voices calling for an extra discount of U.S. forces within the area.”

Israel, the closest U.S. ally within the Center East, has additionally staked out a impartial place on the Ukraine battle, largely due to Russia’s presence within the area. However American officers have been extra forgiving of Israel’s stance as Prime Minister Naftali Bennett conducts shuttle diplomacy. He met with Mr. Putin for 3 hours in Moscow on March 5 after which spoke with Volodymyr Zelensky, the president of Ukraine, by telephone earlier than returning residence. U.S. officers say Mr. Bennett consulted with them in regards to the talks, and Secretary of State Antony J. Blinken mentioned this previous week that they “respect the efforts.”

Juggling Allies in Europe and Asia

In Europe, Russia’s invasion has supercharged the Biden administration’s efforts to revive the morale of a NATO alliance that Mr. Trump undermined.

However the alliance consists of three nations — Poland, Hungary and Turkey — whose democratic backsliding has troubled the Biden administration. Hungary and Turkey have been pointedly excluded from Mr. Biden’s international democracy summit in December, and the European Union has lower billions of euros of funding to Poland and Hungary for what it sees as erosions of authorized and democratic ideas. Now all three nations are collaborating within the coalition in opposition to Russia.

“In occasions of disaster, there may be generally a stress between our values and our pursuits,” mentioned Andrea Kendall-Taylor, a senior fellow on the Heart for a New American Safety. “Within the brief time period, we’re going to need to prioritize pushing again in opposition to Russia, on the danger of taking our foot off the gasoline on the democracy and human rights considerations that had been on the entrance and middle of the Biden administration’s agenda.”

In Asia-Pacific area, a number of vital U.S. companions and allies are working with Washington on sanctions and export controls on know-how in opposition to Russia. These embrace Japan, South Korea, Taiwan, Singapore and Australia. Some Asian nations have agreed to long-term gasoline swaps with Europe to assist relieve a possible Russian shut-off of vitality exports. And Australia has dedicated to spending $50 million to ship weapons to Ukraine, together with missiles and ammunition.

Nonetheless, India — probably the most populous U.S. ally within the so-called Quad coalition of democracies in Asia — has kept away from condemning Russia’s invasion due to decades-old safety ties with Moscow. That stance undermines Mr. Biden’s insistence that democratic nations band collectively in opposition to autocracies.

However it’s the different Asian behemoth, China, that presents the most important diplomatic problem for the USA. China is Russia’s strongest companion, and their bond has strengthened in recent times.

Even because the Russian navy decimates Ukrainian cities and kills a whole bunch or 1000’s of civilians, China has signaled that it stands by Moscow by issuing anti-U.S. declarations and amplifying the Kremlin’s propaganda and conspiracy theories.

Mr. Xi’s persistent help of Mr. Putin, with whom he shares a drive to dilute American energy, has made administration officers wonder if there may be any technique to pull them aside on Ukraine.

On Thursday, William J. Burns, the C.I.A. director, advised U.S. senators he believed that Mr. Xi was “unsettled” by the battle. Some China analysts say that if Beijing needs to salvage its status with Western nations, significantly in Europe, it would conform to take steps to assist Ukraine with out straight breaking from Russia.

Ryan Hass, a China director on the Nationwide Safety Council within the Obama White Home, proposed testing Beijing with particular requests, resembling asking them to supply extra humanitarian assist and chorus from recognizing Russian-installed governments in Ukraine or shielding Russia from battle crimes investigations.

“If China’s leaders take concrete actions to alleviate struggling,” he mentioned, “then lives could be saved and there could be much less centrifugal stress towards cleaving the world into rival blocs.”