Visiting Warsaw, Ukraine's president hinted that Kyiv' forces could pull out of the battleground city of Bakhmut. Meanwhile, Russia's Vladimir Putin had harsh words for the US and EU envoys in Moscow.
Ukrainian President Volodymyr Zelenskyy on Wednesday thanked Poland for its "historic" help as he was on an official state visit to Warsaw.
"You have stood shoulder to shoulder with us, and we are grateful for it," Zelenskyy said after being welcomed by his Polish counterpart, Andrzej Duda.
Poland has been a close ally of Ukraine and played a major role in galvanizing Western military and political support for Kyiv.
Duda said Poland could send all its MiG-29 fighter jets to Ukraine "in the future," having already pledged 14 Soviet-made planes to Kyiv.
"I think that in the future we will be able to transfer our whole remaining fleet of MiG-29s to Ukraine if there is still such a need," he said.
Duda added that Poland was trying to secure additional security guarantees for Ukraine at a July NATO summit, which will be held in the Lithuanian capital, Vilnius.
"Today we are trying to get for Ukraine... additional guarantees, security guarantees, which will strengthen Ukraine's military potential," Duda said. "We have no doubt that your conduct is saving Europe from a deluge of Russian imperialism."
He also awarded Zelenskyy Poland's highest honor, the Order of the White Eagle, for deepening Polish-Ukrainian relations.
Zelenskyy said he hoped the Polish move to open the borders for refugees at the start of the war could become a permanent arrangement.
The Ukrainian leader said he wanted "no borders in political, economic and — especially important — in historical terms."