Here's a detailed timeline of events, which shows the White House was aware of the pause in real time and Trump's decision to reverse the action -- following an unproductive phone call with Russian President Vladimir Putin and a subsequent series of brutal Russian assaults on Ukraine.

As President Donald Trump sours on Russia’s Vladimir Putin, the Pentagon approves Ukrainian weapons requests and Congress moves toward a new sanctions bill.

"What does it say that such a big decision could be made inside your government without you knowing?" a reporter asked.