I just got a great idea: Military Olympics.
Every 2,4,5 or 10 years most of the worlds nations have some of their best soldiers compete with other nations in an Olympic-like competition. The competition is a major part of considering the quality of the world's militaries.
Scenario 1: Friendly competition. Soldiers compete in things like shooting ranges and athletic events. No one dies in these.
Scenario 2: Competitive competition. This one is cooler, but less likely. Soldiers actually fight and kill each other. Battlefields are set up, some small and some large. They fight almost as if it was a war. I think this could hurt relations and allies would(probably) not fight.
Scenario 3: Friendly and Competitive competition. Basically 1 and 2 combined. Probably more likely than 2 and less than 1.
Scenario 2 and 3 are less implausible than you might think. Military competition without combat would be seen as pointless by some. I think it is inevitable that it would, but nations could agree to not to let this affect diplomacy. I do not think any of these are ASB. Which ones do you think are the least unlikely? Do you disagree with me and think these are completely ASB?