If US citizen buys cold war era MiG-15 jet fighter aircraft, which: - had been acquired from the museum (facility of the Ministry of Defense one of the European Union countries, member of NATO) by private person (contract document is available); - is still located in that country; - at least for time being the plane will stay located in that country even after the US citizen buys it from that private person;
Now, since that US citizen is also dual citizen of that country: - Is there anything which he needs to do to be in compliance with US law? - Is there anything which he should not do to be in compliance with US law? - Or, since the plane will stay in that country (no import/export will take place), is everything basically governed by that country law only and he is good just to stay in compliance with the law of that country?
Does the same apply to any weapon/armament accessories present like cannons, gun camera, gun sight, ejection seat? E.g. cannons are now independently stored at the third party, licensed to handle military material. He would not get cannons to his possession until unless they are modified (deactivated) according to the law of that country.