Mongolia has invited Russia to conduct a joint study on the feasibility of building a "trunk" gas pipeline linking the neighboring countries, the Kremlin announced Wednesday.

Mongolia has invited Russia to conduct a joint study on the feasibility of building a "trunk" gas pipeline linking the neighboring countries, the Kremlin announced Wednesday.

The pipeline project was mentioned in a joint declaration signed by Mongolian President Tsakhiagiin Elbegdorj and his Russian counterpart Dmitry Medvedev, who was in Ulan Bator for a two-day visit.

The declaration didn't provide any further details about the proposal, saying only that the two sides wanted to set up "regular and effective dialogue" on the "strategic" issue of energy cooperation.

On Tuesday, Russia and Mongolia agreed to form a joint venture to exploit the Dornod uranium deposit in the resource-rich former Soviet satellite.

Mongolia's Mon-Atom will join forces with Atomredmetzoloto, a unit of state-owned Russian nuclear energy giant Rosatom, to create a 50-50 joint venture that should be launched by year's end.

The joint declaration, signed Tuesday but only released to the press Wednesday, called the 10-year uranium deal "one of the necessary elements of strengthening the Russian-Mongolian strategic partnership."