Poland and Lithuania join Ukraine in calling for stronger Western sanctions on Russia, with Polish President Andrzej Duda saying that "everything must be done" to prevent a potential Russian invasion of Ukraine, and that he was "absolutely against any policy of concessions to Russia".
Estonia, Latvia, and Lithuania announce that they will expel several Russian diplomats involved in espionage activities in solidarity with the Czech Republic. The Czech Republic had ordered most Russian diplomatic staff to leave Prague on Thursday and called on its European allies to do the same.
Amidst ongoing protests against Alexander Lukashenko, Belarus abruptly closes its borders with Latvia, Lithuania, Poland, and Ukraine, while leaving its border with Russia open. Lukashenko insists that the move is to restrict the spread of COVID-19.
Poland releases a new report on the disaster, which killed 96 including then-President Lech Kaczyński, rejecting previous findings and claiming instead air traffic controllers in Smolensk, Russia, gave the jet erroneous information prior to two explosions destroying the jet in midair.
The United States Air Force lands two of its most advanced fighter jets in Lithuania for the first time in a show of support for the Baltic states which have become worried about Russia's actions in Ukraine.
The body of Poland's First Lady, Maria Kaczyńska, is flown to Warsaw to lie in state alongside that of her husband, President Lech Kaczyński. Poland has seen an outpouring of grief since the couple and scores of other senior Polish officials died in a plane crash in western Russia on Saturday.
Polish President Lech Kaczyński lies in state in Warsaw as Russia marks a day of mourning and Poland appoints an acting head of the central bank to replace the one killed in Saturday's air disaster near Smolensk.