The Nuclear Information Project at the Federation of American Scientists estimated that the U.S. had about 3,700 warheads in its nuclear stockpile for delivery by aircraft and ballistic missiles, while Russia and China had 4,309 and 600, respectively.

U.S. President Donald Trump will host the leaders of five Central Asian nations at the White House on Thursday as the U.S. seeks to gain influence in a region long dominated by Russia and increasingly courted by China.