Balloon bombs: How some Syrian rebels plan to beat Russian warplanes

A group of munitions specialists working with Syrian opposition groups say that they have found an ingenious way to counter Russian air raids: balloon bombs. They claim that these balloons, which are laden with explosives, can reach jets flying at altitudes of 10 thousand metres or more. They’ve even released videos to showcase their idea. But is this invention a credible way to combat Russian warplanes?