President Joe Biden leaves on Sunday for Europe, where he will spend four days in three nations tending to alliances that have been tested by Russia's invasion of Ukraine.
The first stop is London, where Biden will meet with King Charles III for the first time since his ascension to the throne. After that is the centerpiece of the trip, the NATO summit in Vilnius, Lithuania. Alliance leaders will debate the war and revise plans for dealing with Russian aggression.
