Practically speaking, the Musandam Peninsula [1]. Open that to the sea and you make everyone except Iraq and Kuwait happy.
Once you have sighted the ship it is an undergrad project to implement target classification and recognition using off the shelf algorithms. It doesn't need a fast GPU because naval engagements are very slow, a cheap mobile phone can do it.
Oman is a regional ally, but they would not stand idly by while their citizens are killed.
Actual short-range weapons can't cross the strait. The ones that can don't care much about the difference on the rest of the place.
Doubtful China would provide that because they want oil, but likely Russia would, because they want high oil prices and American humiliation.