Some governments (like El Salvador and Russia) are moving into bitcoin mining. If more nation-states accumulate BTC, what impact will this have on decentralization and price stability? Could this lead to geopolitical bitcoin wars?
Nope. They only hold 1% of it. They are not the biggest btc whales.
Those real whales just lurk around the ocean, they are literally can't be seen and will not show their identities unless be used in a specific agenda such as politics.
Don't worry too much about decentralization 'cause the feature is not yet defeated, they only hold less, and the community is still that holds the majority.