The soviet union and United States nearly went to war with each other in 1962 when the United States discovered Soviet missiles on the island of Cuba.

well that depends on how deep the hole is. you'd first go through te crust of the earth, then the upper mantle, then the lower mantle then the outer core, then the inner cor then you'd be stuck in the core to melt.

declare war, appoint military officers, sign treaties, make alliances