The leaders of Russia and the United States will sign a document outlining the framework for strategic relations between their two countries at a meeting this weekend, a Kremlin source told Reuters on Tuesday. Russian President Vladimir Putin, who will hand over to his successor on May 7, and U.S. President George W. Bush, who is nearing the end of his term, are to meet on Sunday at Putin's Black Sea residence. "Experts are working on a joint document, which will become a road map of our cooperation during a transitional period and for the medium term," the Kremlin source said. He gave no further details. Washington and Moscow are locked in disputes over issues including U.S. plans to deploy elements of its missile shield in Europe and NATO moves to bring ex-Soviet Ukraine and Georgia closer to the alliance. Russia bitterly opposes both plans, saying they pose threats to its security and could damage the delicate balance of forces in Europe. U.S. and Russian officials say the framework document is designed to allow both leaders to bequeath a stable relationship to their successors. It is expected to note areas on which Moscow and Washington have already found consensus, and also plot a path to reaching agreement on contentious issues such as the missile shield.