You're watching tv and suddenly Putin appears on screen, on all channels. He officially announces that, to set aside all differences between the world powers, he is setting up a world tournament.
All politicians can register and fight for their team. A country can have up to three teams based on political allignment. No civilians, only official politicians and people who work for the government.
People get hyped to the point where officials can't ignore it or laugh it off as ridiculous, and as nations start registering their fighters, no country wants to be left out.
What happens? Who wins against who?