"If the Russians and Iranians aren’t serious about having this [Syrian peace process] work, then we got to go to a Plan B, which may be more confrontational and may wind up carving things out," Kerry stated on Wednesday.
Kerry stated previously that in the coming months, the United States will be testing the "seriousness" of all the stakeholders in Syria, to determine whether the Syrian political transition, agreed to in late 2015 by international powers in Geneva, is possible.
In testimony to the Senate on Tuesday, Kerry explained that the US administration is looking at the partition of Syria as a potential fallback option if diplomacy fails.
Secretary Kerry and Russian Foreign Minister Sergei Lavrov are leading efforts to implement a cessation of hostilities in Syria, set to go into effect on Saturday. The ceasefire is intended to enable humanitarian aid to besieged cities, and advance the political resolution of the country’s five year long civil war.