Western nations will warn Russian President Vladimir Putin on Thursday that his country will pay "ruinous" costs for invading Ukraine during an unprecedented one-day trio of NATO, G7 and EU summits that will be attended by U.S. President Joe Biden.
The hectic day of summitry to maintain Western unity will kick off at the transatlantic defense alliance's headquarters in Brussels, where leaders will agree to ramp up military forces on Europe's eastern flank.
Alarmed by the prospect that Russia might escalate the war with its neighbor after a grinding monthlong conflict, the 30 nations of NATO will also agree to send Kyiv equipment to defend against biological, chemical and nuclear attacks.