Polish Prime Minister Donald Tusk said a missile that crashed into a field in eastern Poland early Thursday was "in all probability" a Russian Kh-101 cruise missile and was armed. The object left a 10-metre crater near the village of Tarnawa Kolonia, 92 kilometres from the Ukrainian border, during a large-scale Russian attack on Lviv, Kyiv and areas near Kryvyih Rih.

Tusk said military experts examining recovered fragments concluded the missile was a Russian Kh-101. Poland's Defence Minister Wladyslaw Kosiniak-Kamysz said about 20 objects were detected near Polish airspace overnight. There were no casualties because the missile landed in a field rather than a built-up area, Tusk said, adding that Poland "were prepared to shoot it down if it had continued its flight".

Nato said it remained in close contact with Polish authorities. Ukraine's acting Foreign Minister Andriy Sybiha declared the missile had "crossed into Poland as part of Russia's massive strike against Ukraine, violating Nato airspace". At least eight people died across Ukraine in the strikes, including six members of one family near Kryvyih Rih, BBC News reports.