Awwal 17, 1432 H / April 21, 2011, SPA -- U.N. Secretary-General Ban Ki-moon will visit Russia on April 21-23 as part of his European tour to discuss nuclear security and the situation in Libya, as Itar-Tass reported. On April 22, Ban will meet Russian President Dmitry Medvedev, the presidential press service said. On the same day the U.N. secretary-general will take the floor at an expanded session of the Permanent Council of the Collective Security Treaty Organization (CSTO) and confer with CSTO Secretary-General Nikolai Bordyuzha. The session will be attended by CIS Executive Committee Chairman Sergei Lebedev, EurAsEC Secretary-General Tair Mansurov, ambassadors of the CSTO countries, chairmen of the State Duma and Federation Council committees for CIS affairs, for foreign relations, for security, as well as representatives of the Russian Foreign Ministry, the press service said. Ban will meet with Foreign Minister Sergei Lavrov to discuss pressing issues of international security. The U.N. secretary-general's talks in Moscow are expected to focus on the situation in Libya, the Middle East settlement and the aftermath of disasters in Japan.