Ukraine intel confirms exchange of fire between Russian units in Crimea

Intelligence representative says soldiers failed to identify fellow troops.          
The exchange of gunfire on late August 6 near Armiansk in  Crimea involved only Russian soldiers. That's according to Vadym  Skibitskyi, Main Directorate of Intelligence's representative. "According to our information, over the night on August 6-7 there  was indeed a shootout between soldiers of Russia's armed forces and  soldiers of Russia's border guards near Armiansk," Skibitskyi said during a briefing on Friday. Read also Tensions escalate as Russia accuses Ukraine of plotting terror attack in Crimea (Updates) "The main reason is the units' failure to identify each other leading to fire for effect," he added. Skibitskyi also said there were casualties, but the exact number is yet to be determined. Russian FSB security service claims it has exposed and arrested a  group of Ukrainians, who allegedly infiltrated Crimea to organise  terrorist attacks on the peninsula. FSB says its officer was gunned down  on late August 6 near Armiansk in northern Crimea after Russian  servicemen attempted to arrest the Ukrainians. Kyiv has called the allegations a provocation. The conflict triggered a new turn of aggravation of ties between  Russia and Ukraine. President Poroshenko ordered to enhance the level of  combat readiness of all the formations and units serving at the  administrative border with the temporarily occupied Crimean peninsula  and the militant-controlled Donbas territories. Ukrainian President has  earlier reported around 40,000 Russian troops are stationed along the Ukraine-Russia border and on Ukraine's occupied territories. Meanwhile, Ukraine's Defence Intelligence warn that combined  Russian-separatist forces, operating in the occupied territories of  eastern Ukraine's Donetsk and Luhansk regions, are plotting massive provocations along the whole contact line.