Ukraine participated in the Eurovision Song Contest 2018 with the song "Under the Ladder" written by Mike Ryals, Kostyantyn Bocharov and Anton Karskyi. The song was performed by Mélovin, which is the artistic name of singer Kostyantyn Bocharov. The Ukrainian broadcaster Public Broadcasting Company of Ukraine (UA:PBC) organised a national final in collaboration with commercial broadcaster STB in order to select the Ukrainian entry for the 2018 contest in Lisbon, Portugal. The national selection consisted of two semi-finals, held on 10 and 17 February 2018, and a final, held on 24 February 2018; nine entries competed in each semi-final with the top three from each semi-final advancing to the final. In the final, "Under the Ladder" performed by Mélovin was selected as the winner following the combination of votes from a three-member jury panel and a public televote.

Kostyantyn Mykolayovych Bocharov, better known by his stage name Mélovin, is a Ukrainian singer and songwriter. He first came to prominence after winning season six of X-Factor Ukraine.