Kirill Aleksandrovich Tolmatskiy (Russian: Кири́лл Алекса́ндрович Толмацкий, born July 22, 1983), better known by his stage name Barney Thorne (Russian: Децл), is a Russian hip hop artist. He graduated in Switzerland and the British International School in Moscow.

In 1999, Detsl made his debut in the Russian rap scene with the album Who Are You?. In 2001, he released his second album, Street Fighter. After working for three years, Detsl released "Aka Le Truk", his third record, in 2004, signaling that he changed his stage name to Le Truk . Detsl's fourth album, MosVegas 2012, was released in January 2008.

Detsl is a pseudonym Kirill Tolmatskiy gained because of his small height (the word "detsl" in Russian slang means "a little").