This photo taken on Aug. 5 2021, shows Atomic Bomb Dome in Hiroshima.(Mainichi)

       NEW YORK (Kyodo) -- A U.N. conference on nuclear nonproliferation scheduled for next month is expected to be postponed again amid the surge of the Omicron variant of the novel coronavirus, diplomatic sources said Tuesday.

       The gathering to review the Treaty on the Non-Proliferation of Nuclear Weapons was scheduled to be held Jan. 4 to 28 in New York after repeated postponements from its original date in 2020 due to the pandemic.

       The United States and some European countries have seen a sharp rise in COVID-19 cases with the advent of the Omicron variant, prompting authorities to bring back some restrictions at indoor venues and on public transportation.

       New York is among the hardest-hit areas during the latest wave of infections in the United States and the administration of President Joe Biden and local authorities are scrambling to get more people vaccinated or receiving booster shots.

       NPT review conferences, which provide a platform for nuclear weapon states to hold discussions with non-nuclear weapon states, have been held every five years since 1975, with the last gathering in 2015.

       Participating countries failed to adopt a consensus document at that gathering due to a growing rift among members.

       Japanese Prime Minister Fumio Kishida said Monday he is considering making a video address to the NPT review conference.

       Some 190 countries have signed the NPT, which is aimed at preventing the spread of nuclear weapons and related technology, promoting cooperation on the peaceful use of nuclear energy and achieving nuclear disarmament.

       A U.N.-adopted Treaty on the Prohibition of Nuclear Weapons, which entered into force in January this year, is more ambitious in its approach to eliminating nuclear weapons, but its effectiveness is in question as it lacks support from any nuclear weapon states such as the United States, Russia and China.

       Japan, the world's only country to have suffered nuclear attacks, has not joined the nuclear ban pact given its reliance on the U.S. nuclear deterrence.

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