information:filtering, structural:expansion, structural:reformatting
Fixed links

The idea of building a fixed link between Sakhalin and the Russian mainland was first put forward in the 1930s. In the 1940s, an abortive attempt was made to link the island via a 10-kilometre-long (6 mi) undersea tunnel. The project was abandoned under Premier Nikita Khrushchev. In 2000, the Russian government revived the idea, adding a suggestion that a 40-km (25 mile) long bridge could be constructed between Sakhalin and the Japanese island of Hokkaidō, providing Japan with a direct connection to the Eurasian railway network. It was claimed that construction work could begin as early as 2001. The idea was received skeptically by the Japanese government and appears to have been shelved, probably permanently, after the cost was estimated at as much as $50 billion.

In November 2008, Russian president Dmitry Medvedev announced government support for the construction of the Sakhalin Tunnel, along with the required regauging of the island's railways to Russian standard gauge, at an estimated cost of 300–330 billion roubles.

In July 2013, Russian Far East development minister Viktor Ishayev proposed a railway bridge to link Sakhalin with the Russian mainland. He also again suggested a bridge between Sakhalin and Hokkaidō, which could potentially create a continuous rail corridor between Europe and Japan. In 2018, president Vladimir Putin ordered a feasibility study for a mainland bridge project.