Moscow and Washington are currently exploring a possible exchange, Russian deputy foreign minister Sergei Ryabkov said on Friday.Talks of Prisoner Swap are 'Strengthening'The Russian news agency Interfax reported Friday that Russian Deputy Foreign Minister Sergei Ryabkov told reporters that the Kremlin hopes the chances of the United States and Russia reaching a deal on arms dealer Viktor Bout are "strengthening.""I hope that the prospect is not just preserved, it is strengthening, and the moment will come when we will get a concrete agreement from the perspective," Ryabkov said.In 2020, he received a 16-year prison sentence.Russia has previously signaled that it wants the U.S. to release Bout, who was convicted of conspiracy to kill U.S. citizens, deliver anti-aircraft missiles and aid a terrorist organization a decade ago."