While coordinating more closely with Washington on Iran during the Medvedev administration, Moscow did not and has not closed the door to engagement with Tehran. In 2010, Russia voted for new, enhanced sanctions against Iran at the United Nations Security Council (UNSC). Nevertheless, Moscow and Tehran have remained engaged diplomatically, and their relations have stabilized and begun to recover from their winter 2010–2011 low point.At the same time, Russia continues to insist that Iran comply with its commitments under the Nuclear Non-Proliferation Treaty (NPT) and cooperate fully with International Atomic Energy Agency (IAEA) inspectors. However, Russia is wary of pushing so hard on compliance lest Iran entirely abandon its treaty obligations and walk out of the NPT.In February 2011, Moscow began to oppose another round of UNSC sanctions, and in July 2011 put forward a "e;step-by-step"e; initiative coordinated with other Permanent Members of the Security Council and Germany (the so-called P5+1). The Moscow approach offered Tehran a gradual reduction in sanctions in return for improved cooperation with the IAEA in monitoring Iran's nuclear enrichment program.Putin's resentment of U.S. power and suspicion of American motives will make for frostier atmospherics between Moscow and Washington. Nonetheless, mistrust of Iran will continue to outweigh Putin's misgivings about the United States. Everything else being equal, the United States will always be more important to Russia than Iran.Most Russian experts now believe that Iran is advancing toward a military nuclear weapons program-though it has not made a final decision to go all the way-and a ballistic missile program to accompany it. Russia sees these programs as a threat to its interests.