KYIV, Ukraine — Ukrainians on Monday reported that that they had pushed again invading Russian forces in fierce preventing round Kyiv and in northeastern Ukraine, whereas the Russians moved to encircle and reduce off Ukrainian forces within the east, making a diplomatic decision to the warfare appear as far-off as ever.

Ukrainian counterattacks round Kyiv reportedly retook extra floor, with the mayor of Irpin, a fiercely contested suburb on the northwestern fringe of the capital, saying that almost all Russian troops had retreated, although preventing continued in some districts. If Ukrainian troopers can preserve management of Irpin, it will be strategically essential to preserving their maintain on Kyiv.

“Our Irpin is liberated from Moscow’s evil,” Mayor Oleksandr Markushin of Irpin posted on Telegram on Monday. However the deputy police chief, Oleksandr Bogai, supplied a extra skeptical account in a phone interview, noting that preventing continued at the same time as most Russian troops appeared to have pulled again, and that the Russians continued to shell the city.

Diplomacy between the warring nations continued, with Russian and Ukrainian delegations arriving in Istanbul for one more spherical of talks set to start on Tuesday.

Whereas Volodymyr Zelensky, the Ukrainian president, has stated that he’s open to discussing the long run neutrality of Ukraine, if he can get safety ensures for his nation and solely after a nationwide referendum, he has refused to concede territory to Russia or to the self-declared republics within the southeastern area generally known as the Donbas, as President Vladimir V. Putin of Russia has demanded.

In Washington, President Biden on Monday stood by feedback he made Saturday about Mr. Putin, “for God’s sake, this man can not stay in energy.” Chatting with reporters, Mr. Biden stated the comment, apparently ad-libbed in a speech he delivered in Warsaw, was an expression of his private outrage, not an announcement of a U.S. coverage that the Russian chief ought to be toppled.

On the battlefield, along with positive factors round Kyiv, the Ukrainians additionally reported essential progress within the Sumy area, northwest of Kharkiv, close to the border with Russia. Dmytro Zhyvytsky, head of regional army administration, stated that the Ukrainians had recaptured the cities of Trostyanets and Boromlya. A Pentagon official confirmed the recapture of Trostyanets.

The Russian military is attempting to chop off the key Ukrainian forces to the east of the River Dnipro, the place the majority of the military has been preventing Russian troops and Russian-backed separatists within the Donbas, which Moscow has acknowledged because the unbiased Donetsk and Luhansk republics. The Russian intention is to maintain the Ukrainian troops from coming to assistance from Kyiv, and Russian army officers stated over the weekend that their warfare effort was now concentrated within the east of the nation.

Regardless of these feedback, Russian forces continued to battle for management of key cities east and northwest of Kyiv.

Russian forces have seized a southern hall between Crimea, which they captured from Ukraine in 2014, and the Donbas, interrupted solely by the besieged port metropolis of Mariupol, which they’ve devastated with artillery, rockets and airstrikes, and seem decided to seize.

“Russian forces seem like concentrating their effort to aim the encirclement of Ukrainian forces instantly dealing with the separatist areas within the east of the nation, advancing from the route of Kharkiv within the north and Mariupol within the south,” the British Ministry of Protection stated in an announcement.

A spokesman for Mariupol’s mayor, Vadym Boichenko, stated on Monday that just about 5,000 folks, together with about 210 youngsters, have been killed there. These figures couldn’t be confirmed. The mayor’s workplace additionally stated that 90 % of the buildings had been broken and 40 % destroyed, and that some 170,000 folks nonetheless stay within the metropolis — once more, figures that can’t be confirmed.

“The state of affairs within the metropolis stays tough,” Mr. Boichenko, who’s not within the metropolis, stated on nationwide tv on Monday. “Persons are past the road of humanitarian disaster. We have to utterly evacuate Mariupol.”

In weeks of talks between Ukrainian and Russian representatives, there have been no clear diplomatic steps towards bringing the warfare to an finish. Mr. Putin’s spokesman, Dmitry Peskov, stated on Monday that whereas the choice to maintain speaking in individual was essential, “We can not but discuss progress and we won’t.”

In an interview on Sunday with unbiased Russian media — an interview censored in Russia itself — Mr. Zelensky restated his willingness to accede to not less than some Russian calls for.

“Safety ensures and neutrality, non-nuclear standing of our state — we’re able to go for it,” he stated.

However it isn’t clear what neutrality would imply. Mr. Putin insists that Ukraine mustn’t ever be part of NATO, a requirement Mr. Zelensky seems to have accepted, but in addition that it demilitarize, a time period that has not been outlined. And it stays unclear if Mr. Putin would settle for Ukraine becoming a member of the European Union, too.

In any case, Mr. Putin has responded with power up to now to Ukraine’s drawing nearer to Europe. He pressured the final Kremlin-aligned Ukrainian president, Viktor Yanukovych, to renege on a promised commerce cope with the European Union. After that sparked protests that compelled out Mr. Yanukovych in 2014, Mr. Putin invaded Crimea and spurred the separatist warfare in Donbas.

On Sunday, Mr. Zelensky once more referred to as for direct negotiations with Mr. Putin, however the Russian overseas minister, Sergey V. Lavrov, repeated on Monday that such talks must anticipate extra progress within the peace talks — and presumably extra progress in Russia’s warfare.

Stories emerged Monday that Ukrainian peace negotiators and a Russian billionaire making an attempt to behave as a mediator might need been poisoned early this month, although the circumstances had been very murky and people affected all recovered.

The primary experiences, by The Wall Road Journal and the investigative group Bellingcat, indicated that not less than two Ukrainian peace negotiators and the Russian oligarch Roman Abramovich, who has tried to behave as a go-between, developed uncommon signs on the identical time in early March after assembly in Kyiv — crimson eyes, fixed and painful tearing, and peeling pores and skin on their faces and fingers.

The outline of the signs was confirmed to The Occasions by somebody near Mr. Abramovich.

Requested concerning the experiences, members of the Ukrainian negotiating workforce didn’t deal with them instantly. “There may be a number of hypothesis, numerous conspiracy theories,” stated one, Mykhailo Podolyak. One other, Rustem Umerov, referred to “unverified info.”

Reuters reported that an unnamed U.S. official “with data” of the matter stated that the illness could have been brought on by “an environmental issue.”

Inside Russia, censorship of the Zelensky interview was simply one other indication of the repression of data — the federal government has basically made it a felony offense to criticize the warfare — and even name it a warfare. On Monday, Novaya Gazeta, the Russian newspaper that helped outline fearless journalism within the post-Soviet period and whose editor, Dmitri A. Muratov, shared the Nobel Peace Prize final 12 months, suspended publication in print and on-line not less than till the top of warfare, leaving Russia with no main media outlet essential of the Kremlin.

President Biden has not withheld his personal contempt for Mr. Putin and this warfare. Mr. Peskov on Monday stated that Mr. Biden’s feedback in Warsaw about Mr. Putin not remaining in energy “are regarding, in fact.” He added that “we’ll proceed following the U.S. president’s statements very fastidiously, we’re scrupulously documenting them and we’ll maintain doing this.”

Emmanuel Macron, the president of France, who’s in search of re-election subsequent month, warned on Sunday towards escalation of phrases or actions, in an implicit critique of Mr. Biden. Mr. Macron, who has had a number of conversations with Mr. Putin, stated he hoped to realize “first a cease-fire after which the entire withdrawal of troops by diplomatic means.” He added, “If we wish to try this, we will’t escalate both in phrases or actions.”

Mr. Zelensky has persistently demanded extra motion from NATO and Western nations — to ascertain a no-fly zone over Ukraine, to provide fight plane, to speed up the stream of superior weaponry, together with armed drones, ground-to-air missiles and anti-tank weaponry, to not point out many hundreds of rounds of ammunition. Washington and its allies have dominated out a no-fly zone; they haven’t refused to supply plane, however to date they haven’t delivered any.

In an interview with the Economist in Kyiv, Mr. Zelensky stated he was dedicated to victory and requested for extra help.

“We imagine in victory,” he stated. “It’s unimaginable to imagine in anything.” However to realize it, he stated, Ukraine wants tanks, armored personnel autos and army plane, and it wants them now.

The West can simply promise to assist in coming weeks, he stated. “It doesn’t enable us to unblock Russia-occupied cities, to carry meals to residents there, to take the army initiative into our personal fingers.” And Russia retains pushing forward, he stated. “The Russians have hundreds of army autos, and they’re coming and coming and coming.”

Andrew E. Kramer reported from Kyiv and Steven Erlanger from Brussels. Reporting was contributed by Carlotta Gall and Maria Varenikova from Kyiv, Valerie Hopkins from Lviv, Ukraine, Anton Troianovski and Ivan Nechepurenko from Istanbul, Michael D. Shear from Washington, and Tariq Panja, Kaly Soto and Cora Engelbrecht from London.