The withdrawal comes amid a series of disputes with Russia over Ukraine, Syria and election interference. Some analysts warn that the sinking of the contract could trigger a new nuclear arms race. Heavy bombs and exceptions. By refitting the B-52H bombers, the United States cut off its nuclear weapons circuits and removed its nuclear weapons switches. However, the United States is not prepared to remove the points of attachment of nuclear weapons, as this equipment is also used for non-nuclear ammunition. Russia has said it cannot verify that these converted aircraft are not able to launch long-range nuclear MELs. Rather, it argues that the refitted bombers should be deployed to air bases without nuclear infrastructure.