One thing to keep in mind is relying on other countries, especially European, to support weapons with spares, etc in time of war.
All it needs is a change in political party in power for even a previously steadfast ally to become unwilling to provide parts for weapons.
We learned a hard lesson in Vietnam about this, from European arms suppliers.
A heavy bit of economic coercion from China could leave us with a very compromised capability at a critical time.
Having said that, the US especially, and UK are much less likely to act in such a way even with a China heavy on them.