territorial dispute
Refers to a dispute over sovereignty or ownership of a territory, often used in political or diplomatic contexts.
The territorial dispute over that island has been a long-standing issue between the two countries.
領土問題 is a more general term for territorial issues, while 領有権問題 specifically emphasizes the right of possession or sovereignty.
Compound of 領有権 (りょうゆうけん, 'sovereignty') and 問題 (もんだい, 'problem').