"We want Washington to exert more pressure on its fellow armed groups operating in Syria in order to engage effectively, fruitfully and constructively in its political track. This group of Riyadh would not have acted the way it acted if it did not benefit from foreign coverage and help from outside," Jaafari said.
"If they felt for a second that their handlers from outside would not be happy with their unilateral decision of freezing [participation in the current round of Geneva talks[, they would not have acted this way. They did it because they got instructions from their handlers to do so. So we expect Washington to exert real pressure on these groups in order to engage positively in the intra-Syrian talks," Jaafari said, when asked to comment on the phone conversation between US President Barack Obama and Russian President Vladimir Putin on Monday.