On Jan. 6, Ukraine’s State Security Service (SBU) released a recording of a phone conversation that suggests that Russian Prime Minister Dmitry Medvedev promised one of the Cossack leaders of Luhansk People’s Republic to equip them with heavy weaponry and provide military experts.

According to the SBU, the people talking on the recording were one of the Cossack chiefs Pavel Driomov and the member of his unit Yevhen (Borshtch). Earlier on Jan. 6 SBU released another recording of intercepted phone calls between Driomov and the members of terrorist groups, where they said that a town of Zolote in Luhansk Oblast was under shelling on Jan. 1.