What is "vasilii"

Li Wei-Jun (born October 27, 1994), better known by his in-game ID Vasilii, is a Chinese League of Legends profession player for the team Vici Gaming, previously playing for the North American League of Legends Championship Series team LMQ (eSports). He is a notable player of the "AD Carry" position, renowned for his highly aggressive play. He has had high achievements both in the North American league as well as internationally. Li, in his prime, has been considered by many analysts and other players in the League of Legends scene as one of the most mechanically skillful players.