The FN Five Seven, or Five-seveN, is Alexei's signature weapon, a Belgium handgun wielded by him throughout all of the NSO Trilogy. It is first seen in Alexei's pocket when he broadcasts the 'Final Message'. Alexei carries it throughout most of the rest of the film, however he leaves it on Lenin's Wrath when he goes onto the beach, forcing him to rely on his ASP instead during the shootout there.
Alexei carries the Five-seveN for the rest of the film series, but he most notably draws and uses it when he and Sally escape from Moscow, when he is in the marshes with his Noble Sixteen, and to injure Inessa during the final showdown. The Five-seveN is left on the floor when Sally, Smith and Inessa carry Alexei out of the room.