Russian President Vladimir Putin and U.S. President Donald Trump will hold a joint press conference at their Alaska summit on Friday after meeting one-on-one and with delegations, Kremlin aide Yuri Ushakov said.

Whether the U.S.-Russia summit can lead to a deal to produce peace in Ukraine more than 3 1/2 years after Moscow’s invasion remains to be seen.

The meeting between U.S. and Russian leaders could lead to peace. But both Presidents Trump and Putin face big challenges in achieving their objectives.