With just one day to go until a U.S.-Russian summit on ending the war in Ukraine, its president, Volodymyr Zelenskiy, visited London on Thursday to shore up European support for efforts to prevent any agreement that would carve up Ukrainian land.

The US-Russia summit lets Putin get back to the top table of international diplomacy and thumb his nose at critics. Here’s what else he stands to gain.

The US president says he held a "very friendly" call with Zelensky and other European leaders ahead of a summit with Putin on Friday.