While it's hard to point to a fully top bottom initiative to create new platforms from the ground up, the Chinese appeared to be making an effort to reduce their non-native surfaces with things like Harmony OS.
A complete plan to reduce vulnerability from untoward influences is more feasible now with agent assisted engineering. You have to be carefully selective about what matters and what doesn't, or the cost and time balloon out of control.
That's also weird, in this reality, isn't it? You've got russians, chinese, etc, supposedly antagonistic to the western cultural hegemony, but then they just rely on western technology tool-chains. If I was guiding any of these countries a close to number 1 priority, technologically speaking, would be to create a completely independent software tool-chain. And talk through adaptors.