Liǎng guó jiù lǐngtǔ zhǔquán wèntí jìnxíng le tánpàn.
The two countries held talks on the territorial sovereignty issue.
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领土主权 is formal diplomatic and legal vocabulary, combining 领土 (territory) with 主权 (sovereignty). Appears constantly in government statements about border disputes, maritime claims, and foreign-policy white papers.
