Though President Vladimir Putin has denied allegations of Russian complicity in the downing of Malaysia Airlines Flight MH17, mounting international pressure to take further action and assist the investigation will soon force him to quit "stalling," a former U.S. ambassador to Russia told CNBC on Monday.
"He's got to make a decision here whether he just doubles down and supports the rebels or whether he uses this tragedy as a moment to say, 'Enough is enough. We will negotiate. We will press for negations with these rebels,'" Michael McFaul, who served as U.S. ambassador to Russia from 2011 to 2014, said on "Squawk on the Street."
He spoke before President Barack Obama issued a statement outside the White House pressing Putin to be more cooperative.