MOSCOW, July 6 - US President Barack Obama arrives in a rainswept Moscow on Monday for talks with his Russian counterpart Dmitry Medvedev as the US and Russia look to improve relations. As well as Monday's talks with Medvedev, Obama will also meet with Russian Prime Minister Vladimir Putin on Tuesday. He is also due to meet with representatives of a number of civil and political organizations, as well as former Soviet leader Mikhail Gorbachev. Obama, on his first visit to Russia since ...