Moscow will be represented by Russian President Vladimir Putin's assistant Vladimir Medinsky, Deputy Foreign Ministers Sergei Ryabkov and Mikhail Glozin, as well as representatives of the two departments of the General Staff of the Armed Forces Igor Kostyukov and Yuri Zhigerlovsky. Earlier, the US Secretary of State Marco Rubio revealed the main topic of the upcoming negotiations on Ukraine. According to him, the main topic of discussion will be security guarantees for the parties to the conflict.