Russian President Vladimir Putin on Thursday praised President Donald Trump for his efforts to broker an end to Moscow's invasion of Ukraine.

Donald Trump and Vladimir Putin hold talks in Alaska on Friday, with the U.S. president's hopes of sealing a ceasefire agreement on Ukraine uncertain but with a last gasp offer from Putin of a possible nuclear deal that could help both men save face.

U.S. President Donald Trump is meeting with Russian President Vladimir Putin in Alaska at a U.S. military base for a crucial summit.