The incident escalated a campaign by the ousted Law and Justice party to resist the transfer of power after it lost its parliamentary majority in October.
Parliament rejected a new government proposed by the caretaker prime minister, Mateusz Morawiecki, whose party, Law and Justice, lost its parliamentary majority in an October election.
Polish leaders backed Ukraine’s bid for NATO membership, but even without that, Russia’s invasion is making the alliance’s eastern flank more united, and more important.
The Polish leader said he would send jets designed by the Soviet Union to help Ukraine fend off Russian forces. It was unclear if other allies might follow suit.