Tonight, January 31, a Ukrainian drone crashed on the territory of the Nevsky Oil Refinery in Russian St. Petersburg. According to a source in the special services, the operation was organized and conducted by the Defense Intelligence of Ukraine. The source explained the Russians attempted to shoot down the Ukrainian UAV using the S-400 complex – the most powerful air defense system in the Russian arsenal. However, the interception proved ineffective, and the drone still fell on the territory of the Nevsky Oil Refinery. “It is noteworthy that they used the S-400 to target our drones. It is ver…