> Ukraine cannot target Chinese owned or associated assets without facing domestic blowback from China such as sudden loan repayments or export controls on intermediate parts

Fair enough for ownership. Don't think so for associated.

That said, China being sensitive to such attacks is itself leverage for Kyiv. China retaliating against Ukraine in the way you describe would be a massive geopolitical win for America, inasmuch as it would make clear the deal with the devil every adversary of Russia, Iran and North Korea's makes when they rely on China.

> Ukrainian missiles aren't reaching Vladivostok or Sakhalin unless we give them ICBMs

Launch from a container ship.