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.
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!
First cargo train on the final link of Amur-Yakutsk line in historic expansion of Siberia's great railways.