The Russian president made the announcement on state television, arguing that it would not breach non-proliferation agreements and that it would match similar arrangements that the US has with several of its European allies.
Putin has repeatedly made nuclear threats or escalated nuclear rhetoric after the full invasion of Ukraine, but this is the first time the Russian leader has announced a plan to station nuclear weapons in another country.
Moscow has 5,977 nuclear warheads in its inventory, according to the Federation of American Scientists, and has long had the capability to strike a target anywhere in the world. The US has slightly fewer, at about 5,428.
Russia will have completed the construction of a storage facility for tactical nuclear weapons in Belarus by 1 July, Putin said, but no timetable was given for when the bombs would physically move into the country.
Russia has stationed 10 aircraft in Belarus capable of carrying tactical nuclear weapons, Putin said, and equipped them appropriately. Aircrews would be trained from 3 April, the president added.
Putin also said that Russia had given Belarus Iskander missile systems that can be used to launch nuclear weapons, although it was unclear whether that reflected the type of bombs to be deployed.
The Russian leader also bizarrely claimed that Lukashenko had asked about nuclear weapons following a statement earlier this week by the UK that it would be supplying depleted uranium shells with its fleet of Challenger 2 tanks.
Depleted uranium is a by-product of the enrichment process to make nuclear weapons or fuel, so as a result is less radioactive. Its military purpose is as a tough and penetrating metal for shells and, while its toxicity makes its use on the battlefield controversial, it is not in any sense a nuclear weapon.
