Dhaka, Oct. 18 -- Russia and the United States should build a "Putin-Trump" rail tunnel under the Bering Strait to link the two countries, unlock joint exploration of natural resources and "symbolize unity", a Kremlin, a Kremlin envoy has suggested.

The proposal by Kirill Dmitriev, President's Vladimir Putin's investment envoy and head of Russia's RDIF sovereign wealth fund, envisages a construction project costing 8 billion dollars funded by Moscow and "international partners" to build a 70-mile (112-km) rail and cargo link in under eight years.

Dmitriev, who has helped spearhead a Russian charm offensive designed to revive U.S.-Russia ties, floated the tunnel idea late on Thursday after Putin spoke to U.S. President Donald Trump by ph...