USA in Nicaragua on T2? That does not happen very often. Think as USSR, I'd not coup Nicaragua and press elsewhere on T2 as there are more important targets. If USA chooses to use more precious early ops to realign Cuba, then USSR can always coup Nicaragua to regain access to Cuba in mid war.
1 inf in costa rica is one of my priority turn 1 now. Taking cuba as usa early war is a huge reward in LT: 3 vp switch every scoring, temporary domination in CA and requierement for what i consider as the stronguest headline in the 1st rounds of middle war if ussr in not destalenized: CMC