Follow Arms Control Wonk. There's a bunch of OSINT folks in the podcast slack channel including friends of mine that have been interviewed by magazines like The Economist.

I'm there more for the cyberwarfare takes, but from what I understand nobody is seriously worried about a power imbalance between China and America regarding missile speed since interceptors aren't accurate enough, but that's just me regurgitating what I see tweeted around and talked about.

Edit: And don't be intimidated by people reverse engineering sidewinders in the Slack. The community is very open to humble, curious newcomers. They'll teach you how to analyze satellite imagery for free, haha.