After Russia has promised to withdraw most of its forces from Syria, it remains unclear why President Vladmir Putin has made such a move.
Wesley Clark, a retired four-star general and former NATO supreme allied commander, told CNBC's "Power Lunch" on Tuesday that there are several possible reasons why Putin may have promised a withdrawal.
"One reason to do it is because, frankly, Russia's economy is short on funds and maybe wants the defense money to go somewhere else," Clark suggested. "Another reason to do it is maybe this pleases the Europeans and he's making efforts to get sanctions relieved."
Clark also said that Putin may have use for these forces elsewhere.
"Maybe there's a role for these Russian forces returning to reinforce Putin's hand in Ukraine," Clark added, "We don't know all his motives at this point."