Seven people, including a seven-year-old girl, were killed and 64 others injured when Russia hit Lviv with missiles overnight into Wednesday, regional officials said.
The attack also damaged many historic buildings in the western Ukrainian city near Poland's border, according to reports.
"Lviv needs help," Tusk said on social media.
"The Russian attack targeted the city centre, damaging many historic residential buildings," he added.
"Poland is ready to help rebuild them," he declared.
The Warsaw-based Polonika National Institute of Polish Cultural Heritage Abroad said that Russian missiles destroyed residential and public buildings, "many of which are within the buffer zone of a UNESCO World Heritage site."
It added that it was in contact with Lviv authorities to assist in restoring and preserving the city's invaluable heritage.
Polish foreign ministry condemns Russian attack on Ukraine's Lviv
The Polish foreign ministry on Wednesday condemned the Russian attack on Lviv, reaffirming Warsaw's continued support for Kyiv in its defence against Moscow's aggression.
"We condemn the Russian missile attack on civilians in Lviv," the Polish foreign ministry said in an X post, noting that the number of victims continued to rise.
"We express our deep sympathy and solidarity with the people of Ukraine," it added.
The aftermath of a Russian missile strike on Lviv, western Ukraine, Sept. 4, 2024. Photo: EPA/NATIONAL POLICE OF UKRAINE via PAP
"Poland will continue to support Ukraine in its defence against Russian aggression," the Polish foreign ministry declared.
Russia invaded Ukraine on February 24, 2022, starting the largest armed conflict in Europe since World War II.
Wednesday is day 924 of Russia’s war on Ukraine.
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Source: IAR, PAP