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How was the China-Russia border dispute along the Ussuri River eventually resolved?

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Topographic map of the Amur River basin and its drainage network, covering parts of northeastern China, eastern Russia, Mongolia, and North Korea. The map uses color shading to indicate elevation, shows major rivers and tributaries, surrounding mountain ranges, swamps, marshes, and lakes, and includes a locator inset of the region within Asia. Major cities, railways, and dams are also marked. — Amur River The Amur River basin and its drainage network.

The border dispute between China and the Soviet Union (later Russia) along the Ussuri River was a long-standing conflict that escalated into an armed clash in 1969.

Initial efforts to manage the tension began in 1977, when the two nations reached a limited agreement regarding navigation rules on the river. Following these early steps, the countries engaged in protracted negotiations for several decades. The dispute was finally resolved in 2004, when China and Russia reached a formal agreement settling all remaining issues concerning the border along the river.1