From a politico.com story by Lara Seligman headlined “Biden administration braces for Putin’s Victory Day surprise”:

President Joe Biden authorized another tranche of military aid to Ukraine and leveled new sanctions on Moscow this week, as the West braces for a possible escalation of the conflict from Russia’s unpredictable leader on Monday.

The U.S. president’s latest show of military support came just ahead of Russia’s May 9 anniversary of the defeat of the Nazis in World War II. It is a milestone Russian President Vladimir Putin plans to mark with an extravagant military parade through the streets of Moscow — and potentially a formal declaration of war against Ukraine.