The United States, Russia, China, and India are known to possess a nuclear triad, meaning they can deliver nuclear weapons by land, sea, and air.
Notes on verification
The four countries listed do possess nuclear triads, confirmed by the source article, but the claim is incomplete since Pakistan also achieved triad status in 2017 per multiple independent sources.
Sources
- List of nuclear weapons (en.wikipedia.org)
- https://vajiramandravi.com/upsc-exam/nuclear-triad/ (vajiramandravi.com)
- https://nationalinterest.org/blog/buzz/heres-why-americas-nuclear-triad-is-so-important (nationalinterest.org)
- https://www.ibtimes.co.uk/china-h6n-jl1-nuclear-triad-air-leg-1819426 (ibtimes.co.uk)
- https://www.wionews.com/photos/only-4-countries-have-the-ultimate-nuclear-weapon-advantage-who-controls-the-world-s-nuclear-triads-1763975782185 (wionews.com)
- https://chinapower.csis.org/china-nuclear-weapons/ (chinapower.csis.org)