Russian President Dmitry Medvedev will participate in a nuclear security summit hosted by US President Barack Obama later this month, the Kremlin announced Monday. The two-day summit will get underway in Washington on April 12 - days after Medvedev and Obama are scheduled to finalize a new nuclear arms reduction treaty, dpa reported. The two leaders will meet in Prague on Thursday to sign the new START agreement. Medvedev will also travel to Argentina for a state visit next week, with a further stop planned on April 15 and 16 in Brazil for a summit of the BRIC nations - Brazil, Russia, India and China.