Friday's meeting will mark the first time Putin will be in the U.S. since 2015. Trump on Monday mistakenly said he was "going to Russia" as he discussed the summit, though he also praised the fact that Putin is coming to the U.S. rather than the other way around.

The threats, pressure and ultimatums have come and gone, but Russian President Vladimir Putin has maintained Moscow’s uncompromising demands in Ukraine, raising fears he could use a planned summit with U.