Geographys
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Mongolia–Russia border

A long border between Siberia and Mongolia, whose only other neighbour is China. Russia wants to lay the Power of Siberia 2 gas pipeline across it and through Mongolia to China, a project the three leaders backed in 2025 but whose price was still unsettled in 2026.

Written from cited sourcesLast checked 29 September 2026Suggest a correction

RUSSIAMONGOLIAChina tripoint (west)China tripoint (east)
Today’s borderFrom the western tripoint with China east to the eastern tripoint with China.

See it on the globe:Mongolia →Russia →

Between two giants

Mongolia conducts much of its dealings with its two giant neighbours, Russia and China, through a three-way summit. At the seventh, on 2 September 2025, the three leaders backed the Power of Siberia 2 pipeline, and Mongolia’s presidency said they had affirmed their commitment to a gas pipeline from Russia to China via Mongolian territory; Gazprom said it had signed a legally binding memorandum with China’s CNPC to build it.[2]

“a project for the construction of a natural gas pipeline from Russia to China via Mongolian territory”[2]

Office of the Mongolian President, September 2025

Power of Siberia 2

The pipeline would run about 2,600 km from western Siberia through Mongolia to China, carrying 50 billion cubic metres of gas a year. Analysts told Al Jazeera Russia wants it to replace revenue lost when Europe cut its imports of Russian gas after the 2022 invasion of Ukraine, while China sees it as more secure than shipped LNG. In May 2026 the Kremlin said there was agreement on the route and construction, but no timetable, and analysts said price was still the main obstacle.[1]

Timeline

  1. 2020

    Talks begin

    The three countries start discussing Power of Siberia 2.[2]

  2. 20252 September 2025

    Trilateral summit

    A memorandum to build the pipeline is signed.[2]

  3. 202620 May 2026

    Route agreed

    Russia and China say they agree on route and construction.[1]

More borders

Sources

  1. [1]
  2. [2]

Map geometry from Natural Earth via world-atlas. See credits.

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