Currently, the U.S. bans its own airlines from flying over Russian airspace, but the ban doesn't generally apply to foreign airlines that serve the U.S.
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There are several reasons why, but the big two are to do with the curvature of the earth and the jet streams. Guessing that it was a safety precaution wouldn't be entirely wrong either, as when planning a route many pilots prefer to maximize the number of airports along their flight path.
While U.S., European and Japanese carriers have stopped flying over Russia, Air India and some Gulf-based and Chinese airlines continue to do so, making flying times shorter and giving them a cost edge over competitors.
The FAA is a year-round, 24/7 operation, responsible for 5.3 million square miles of U.S. domestic airspace and 24 million square miles of U.S. airspace over the oceans.
Russia has barred U.S. airlines and other foreign carriers from flying over its airspace, in retaliation for Washington banning Russian flights over the U.S. in March 2022 after the country invaded Ukraine.
The Siberian Corridor has the most expensive airspace in the world. While airlines save a lot of money by flying more directly, Russia takes a big chunk of that money for itself with absolute control on overflight rights with overflight fees being $100 per passenger!
A citizen of a foreign country who seeks to enter the United States generally must first obtain a U.S. visa, which is placed in the traveler's passport, a travel document issued by the traveler's country of citizenship.
The most common reason is that there are no airstrips or airports on many of the small islands, so if a plane had to make an emergency landing, it would be difficult to find a place to land. Additionally, the Pacific Ocean is vast and remote, so if a plane were to go down, it would be very difficult to find.