High Cost however is not a valid defence in such charged geopolitical environment. Specially when rare earths themselves are a pretty small commodity by value. Even paying 5x the cost for heavy rare earth elements wouldn't be too bad.
Think of it like this, would China have cared if it had a EUV machine at 5x the cost of western one?
Unless the price is in multiple hundreds of extra billions, it wouldn't matter.
Very high cost