If one side gains a major advantage they may decide to attack knowing that you'll have the worst of it. The weaker side may be more likely to use thier ultimate

If one side gains a major advantage they may decide to attack knowing that you'll have the worst of it. The weaker side may be more likely to use thier ultimate out of desperation and "nothing left to lose" type thinking. The US is already at a significant disadvantage. Russia's nuke-based nuclear interceptor missiles are an order of magnitude more effective than America's explosive and kinetic-based interceptors.