They promise to build a tunnel under the Bering Strait with associated infrastructure in just 15 years and 205 billion dollars. (16.6 trillion rubles at current exchange rates). The Sochi 2014 Olympic infrastructure cost 2.65 trillion in old money. Ruble, Cosmodrome Vostochny - almost 2 trillion, highway M12 Moscow - Kazan -1.1 trillion. Crimean bridge - 228 billion.
On the Russian coast, the bridge will lead to an isolated area with no year-round access. There is a 40 km road 140 km away, but it does not lead to the highway network of the rest of Russia. There are no particular railroads there; The nearest suitable point is Bikotia, about 3,700 km away. It's about the same as from Moscow to Kemerovo, Barcelona or Tehran - only more complex terrain and climate.
On the American side the situation is a little better. Dirt road 10 km to Tin City. 175 km away there is a small network of local roads that are not even connected to Anchorage. Alaska has a railroad, but it does not reach the coast of the Bering Strait and is not connected to the roads of Canada and other countries. But that's actually their problem. Super project, but the main thing, as in space, is to talk about the "big" plans, so no one will remember. And apparently you can make money from development.