The United States is gearing up to increase pressure on Russia over what it claims are Moscow's flagrant violations of an important Cold War-era arms treaty. The Intermediate-Range Nuclear Forces (INF) Treaty is a cornerstone arms control pact between the United States and Russia that halted a destabilizing buildup of intermediate-range nuclear missiles in Europe during the 1980s. The United States has accused Russia of developing, testing and deploying a cruise missile that violates the limits set by the INF, and Moscow in turn has accused Washington of deploying drones and missile launchers that violate the terms of the treaty.