A group of former U.S. officials, including former Defense Secretary William Perry, and experts on nuclear disarmament sent an open letter Monday asking Japanese political parties not to oppose a "no-first-use" nuclear stance that may be announced by the United States.

The letter, addressed to Prime Minister Yoshihide Suga, among other party leaders, states how U.S. President Joe Biden is considering a declaration saying the United States would not use nuclear weapons in an initial attack, requesting Japan support the policy after the country expressed opposition earlier in the year.

The move came as Japan marked the 76th anniversary of the wartime atomic bombings of Hiroshima and Nagasaki on Friday and Monday, respectively.