Explainer-What are tactical nuclear weapons and what is Russia's policy?

FILE PHOTO: Russian President Vladimir Putin attends a joint statement with Chinese President Xi Jinping following their talks at the Kremlin in Moscow, Russia March 21, 2023. Sputnik/Vladimir Astapkovich/Kremlin via REUTERS

(Reuters) - Russia has a deal to station tactical nuclear weapons on the territory of neighbouring Belarus, President Vladimir Putin said on Saturday, adding this will not violate non-proliferation agreements. What are these weapons and what is Russia's policy on them:

WHAT ARE THE CONCERNS