On the other hand, like FOSS OSes, it represents a way that countries can free themselves from current administration as geopolitics keep going into the bad direction.

It was a great decision to take RISC-V foundation outside USA.

Isn't the biggest competitor to US-controlled x86 owned by ARM Ltd. based in the UK, not the US?

Kind of, ARM is no longer UK property so to speak, it is 90% owned by SoftBank, a Japanese holding.

However your point stands.