A duo of U.S. senators have introduced a bill to significantly enhance support for Taiwan, including provisions for billions of dollars in U.S. security assistance and changes to the decades old law undergirding Washington's unofficial ties with the Chinese-claimed democratic island.

The United States, which accuses China of ramping up military coercion toward Taiwan, is its main supporter and arms supplier, a point of increasing friction between Washington and Beijing, whose relations are already at their lowest point in decades.

The senators' Taiwan Policy Act of 2022 threatens severe sanctions against China for any aggression against Taiwan, and would provide $4.5 billion in foreign military financing over the next four years, as well as designate Taiwan a "major non-NATO ally," according to the text.