Chronology (January-December 2021)
| Jan | Entry into force of Treaty on the Prohibition of Nuclear Weapons (22nd) |
| Feb |
The five-year extension of New START (3rd) Iran announced that it suspended the verification and monitoring measures under the JCPOA (23rd) |
| Mar |
The United Kingdom announced its nuclear policy that it would increase the limits on the number of nuclear weapons to 260 warheads (16th) |
| Apr |
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| May |
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| Jun |
Russia announced that it conducted subcritical nuclear tests (6th) U.S.-Russian summit in Geneva, in which “U.S.-Russia Presidential Joint Statement on Strategic Stability” was issued (16th) |
| Jul |
The P5 Conference (online) IAEA published “Computer Security for Nuclear Security No. 42-G” The first meeting of U.S.-Russia Strategic Stability Dialogue (28th) |
| Aug |
Hiroshima Peace Memorial Ceremony (6th) Nagasaki Peace Memorial Ceremony (9th) |
| Sep |
IAEA issued Nuclear Security Plan 2022-2025 (15th) The 65th General Conference of the International Atomic Energy Agency in Vienna (20-24th) IPNDV Virtual Symposium (online) (28th) |
| Oct |
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| Nov |
The second session of the Conference on the Establishment of a Middle East Region Free of Nuclear Weapons and Other Weapons of Mass Destruction in New York (29th- December 3rd) |
| Dec |
The P5 Conference in Paris (2-3rd) NPT Review Conference was further postponed to August 2022 (30th) |
