[pydry]

Russia and China have to deal with this too (through different mechanisms), so it's not unexpected that they'd do it back.

They are also at much higher risk of fragmentation. Russia with the far east, etc. China with Xinjiang, etc.

I wouldn't expect them to stop unilaterally. It would require a treaty like SALT, which the US has shown zero appetite for - likely coz it sees fragmentation of rival states as a bigger prize than preventing political arguments at thanksgiving.