On February 24, two days after Russia and the United States negotiated the ceasefire in Syria, the White House said that Washington was "not ruling out a Plan B" in case the truce did not hold. Later, reports emerged that the Central Intelligence Agency and its regional partners were preparing Plan B in Syria which would include deliveries of various types of anti-aircraft weapons to Syrian rebels.
"Now that the cessation of hostilities is effectively dead, it looks like it’s time to consider what Secretary Kerry referred to as ‘Plan B’, and I look forward to him laying that out very soon," Corker said in a statement on Friday following his conversation with senior Syrian opposition leader Dr. Riyad Hijab.
Corker noted that after speaking with Hijab, he understands why the opposition left the Geneva talks and explained that Syrian President Bashar Assad "continues to target civilians, block humanitarian access, and refuse the release of detainees."
On Monday, the members of the Syrian opposition High Negotiations Committee (HNC) announced they would suspend its participation in the ongoing peace talks in Geneva, citing serious violations of the cessation of hostilities.