KYIV, Ukraine — Ukraine said Tuesday that Russia seemed to soften its stand in the talks aimed at halting the fighting, even as Moscow's forces stepped up their bombardment of Kyiv, smashing apartments, a subway station and other civilian sites.
Elsewhere around the country, civilians in at least 2,000 cars fled Mariupol along a humanitarian corridor in what was believed to be the biggest evacuation yet from the desperately besieged seaport, where bodies have had to be buried in mass graves.
Also, the leaders of three European Union countries — including Poland, a NATO member on Ukraine’s doorstep — visited the embattled capital in a bold show of support amid the danger.
The talks between Russian and Ukrainian representatives, with the latest round held Tuesday via video, have become “more constructive,” and Russia has stopped airing its demands for Ukraine to surrender, said Ukrainian presidential aide Ihor Zhovkva.
Zhovkva said the Ukrainian representatives felt “moderately optimistic” after the latest talks, adding that it would be necessary for President Volodymyr Zelenskyy and Russia's Vladimir Putin to meet to make major progress.
With the number of people driven from the country by the war eclipsing 3 million, l arge explosions thundered across Kyiv before dawn from what Ukrainian authorities said were artillery strikes, as Russia’s assault on the capital appeared to become more systematic and edged closer to the city center.
Zelenskyy said barrages hit four multi-story buildings in the city and killed dozens. The strikes, carried out of the 20th day of Russia's invasion, disrupted the relative calm that returned after an initial advance by Moscow's forces was stopped in the early days of the war.
A senior U.S. defense official, speaking condition of anonymity to discuss the Pentagon's assessment, said the Russians were using long-range fire to hit civilian targets inside Kyiv with increasing frequency but that their ground forces were making little to no progress around the country. The official said Russian troops were still about 15 kilometers (9 miles) from the center of the capital.
The official said the U.S. has seen indications that Russia believes it may need more troops or supplies than it has on hand in Ukraine, and it is considering ways to get more resources into the country. The official did not elaborate.
Before Tuesday's talks, Ukrainian presidential aide Mykhailo Podolyak said they planned to discuss a cease-fire and Russian troop withdrawal. Russian Foreign Minister Sergey Lavrov said Moscow would press its demands that Ukraine drop its bid to join NATO, adopt a neutral status and “demilitarize.”
In a statement that seemed to signal potential grounds for agreement with Moscow, Zelenskyy told European leaders gathered in London that he realizes NATO has no intention of accepting Ukraine.
“We have heard for many years about the open doors, but we also heard that we can’t enter those doors,” he said. “This is the truth, and we have simply to accept it as it is.”
NATO does not admit nations with unsettled territorial conflicts. Zelenskyy has repeatedly said in recent weeks that he realizes NATO isn’t going to offer membership to Ukraine and that he could consider a neutral status for his country but needs strong security guarantees from both the West and Russia.
The U.N. said close to 700 civilians in Ukraine have been confirmed killed, with the true figure probably much higher.
Fox News video journalist Pierre Zakrzewski was killed when the vehicle he was traveling in was hit by fire Monday on the outskirts of Kyiv, the network said. He was the second journalist killed in Ukraine in two days.
Ukrainian Prime Minister Denys Shmyhal said in a tweet that the leaders of Poland, the Czech Republic and Slovenia had arrived, lauding “the courage of true friends.” He said they were discussing support for Ukraine and further sanctions against Russia.
New efforts to bring civilians to safety and deliver aid were underway around the country. The Red Cross said it was working to evacuate people from the northeastern town of Sumy near the Russian border in about 70 buses.
One of the most desperate situations is in Mariupol, the southern city of 430,000 where officials say a weekslong siege has killed more than 2,300 people and left residents struggling for food, water, heat and medicine.
The Mariupol city council reported that 2,000 civilian cars had managed to leave along a humanitarian corridor that runs for more than 260 kilometers (160 miles) west to the city of Zaporizhzhia. Another 2,000 cars were waiting to leave along the route, the council said.
Fighting has intensified on Kyiv's outskirts in recent days, and air raid sirens wailed inside the capital. The mayor imposed a curfew extending through Thursday morning.
Tuesday's artillery strikes hit the Svyatoshynskyi district of western Kyiv, adjacent to the suburb of Irpin, which has seen some of the worst fighting of the war.
Flames shot out of a 15-story apartment building and smoke choked the air as firefighters climbed ladders to rescue people. The assault blackened several floors of the building, ripped a hole in the ground outside and blew out windows in neighboring apartment blocks. Rescue workers said at least one person was killed.
“Yesterday we extinguished one fire, today another. It is very difficult,” a firefighter who gave only his first name, Andriy, said outside the building, tears falling from his eyes. “People are dying, and the worst thing is that children are dying. They haven’t lived their lives and they have already seen this."
City authorities also tweeted an image of the blown-out facade of a downtown subway station that had ben used as a bomb shelter and said trains would no longer stop at the station.
A 10-story apartment building in the Podilsky district of Kyiv, north of the government quarter, was damaged. Russian forces also stepped up strikes overnight on Irpin and the northwest Kyiv suburbs of Hostomel and Bucha, said the head of the capital region, Oleksiy Kuleba.
“Many streets have been turned into a mush of steel and concrete. People have been hiding for weeks in basements, and are afraid to go out even for evacuations,” Kuleba said on Ukrainian television.
In the country's east, Russian forces launched more than 60 strikes overnight on Ukraine’s second-largest city, Kharkiv, according to regional administration chief Oleh Sinehubov. The strikes hit the city’s historical center, including the main marketplace.
Sinehubov said the bodies of dozens of civilians were pulled from destroyed apartment buildings.
In Mykolaiv, a strategic southern city near the Black Sea where airstrikes killed nine people Sunday, residents braced for more attacks. Volunteers prepared food and sorted donated clothes. Molotov cocktails for use against the invaders were stockpiled.
We are bombed during the day and during the night," said Svetlana Gryshchenko, whose soldier son was killed in the fighting. “It's a nightmare what Russia is doing on the territory of Ukraine.”
Associated Press writers Lolita C. Baldor in Washington, Raf Casert in Brussels and AP journalists from around the world contributed to this report.