The Trump administration is bracing for the potential collapse of Cuba's totalitarian government as early as this summer, and has war-gamed new military response plans in case the island descends into chaos, U.S. officials tell Axios. Why it matters: President Trump hasn't authorized an invasion and prefers a peaceful transition to a free Cuba, so the administration will keep pushing economic sanctions to try to strangle the regime in Havana in a slow-motion constriction. "The best way to describe it is 'accelerationism,' " one senior administration official said, referring to the philosophy of hastening societal collapse . "But we don't want to kill off the regime just yet. There's a method to this. It's in stages." Zoom in: This methodical squeezing of Cuba's communist regime is also designed to buy time for Trump — who's now engrossed in peace talks with Iran — to eventually focus on Cuba and decide how to bring about change there.…