The move comes amid hope of large-scale investment from Seoul into Siberia.
Going by train all the way from Beijing (or even London) to New York could become a reality.
Fears for plan to stimulate Russian economy via major infrastructure links to Asia and Europe as Beijing announces rival scheme.
Officials from Russia and North Korea say the long-waited train connection is now almost ready.
The distance between capital city Moscow and key Siberian cities could shrink in plan envisaged by the Kremlin leader.
The Russian government is to give priority to Siberia and the Far East as it puts modernisation on fast-forward, insists Dmitry Medvedev.
One estimate is half a million new jobs stemming from improvements to the Baikal-Amur Mainline link amid hopes of foreign investment.
Travel for the first time by train to Russia's diamond capital, the coldest city in the world!
Hope for millions around world with preparations under way for clinical trials on people starting next year.