If Russia faces the choice of losing Crimea or using nuclear weapons on the battlefield, it will choose the latter, the head of SpaceX and Tesla, Elon Musk, wrote on Twitter, responding to one user.

"[The West has] already sanctioned/cutoff Russia in every possible way, so what more do they have left to lose? If we nuke Russia back, they will nuke us and then we have WW3," he wrote.