Atomic bomb survivors in Japan on Thursday urged the administration of new U.S. President Joe Biden to join a U.N. treaty banning nuclear weapons that will take effect the following day.

"We earnestly call for (U.S.) participation in the treaty," said Michiko Kodama, 82, assistant secretary general of the Japan Confederation of A- and H-Bomb Sufferers Organizations at a Tokyo press conference.

The Treaty on the Prohibition of Nuclear Weapons adopted in 2017, the first international pact outlawing the development, testing, possession and use of nuclear weapons, will enter into force Friday after 50 countries ratified it.