THE HAGUE (Reuters) - Dutch and German intelligence agencies have gathered evidence of widespread Russian use of banned chemical weapons in Ukraine, including dropping a choking agent from drones to drive soldiers out of trenches so they can be shot, they said on Friday. Dutch Defence Minister Ruben Brekelmans called for tougher sanctions against Moscow. "The main conclusion is that we can confirm Russia is intensifying its use of chemical weapons," he told Reuters. "This intensification is concerning because it is part of a trend we have been observing for several years now, where Russia's use of chemical weapons in...