I imagine this would cause controversy in choosing the diversion method. Say an asteroid was predicted to impact the USA. As you increase the amount of diversio

I imagine this would cause controversy in choosing the diversion method. Say an asteroid was predicted to impact the USA. As you increase the amount of diversion, the impact point will move across the Earth before it finally misses entirely. What about the countries along that path? How do they be sure that the USA doesn't partly deflect the astroid, endangering them?