 Complete the following phrase:  Unit 29155 is tasked with foreign assassinations and other covert activities aimed at destabilizing European countries. The Unit is thought to have operated in secret since at least 2008, though its existence only became publicly known in 2019. It is commanded by Maj. Gen. and based at the headquarters of the 161st Special Purpose Specialist Training Center in eastern Moscow. Its membership included some decorated veterans from the Soviet war in Afghanistan and Russias wars in Chechnya and Ukraine. It has been linked to the 2014 Russian annexation of Crimea, the 2015 poisonings of Bulgarian arms dealer Emilian Grebev also spelled Emilyan, the 2016 Montenegro coup attempt, and the 