Why the world is so worried about Russia’s ‘tactical’ nuclear weapons

The war in Ukraine has led to a resurgence of fears about the use of nukes.

Russia is armed to teeth with nuclear weapons, which some analysts fear it would consider using to escalate the conflict if it felt it was losing, and Ukraine’s Western backers are also armed with nukes, which means that the conflict — if it were to spiral beyond Ukraine — would pit nuclear powers against each other.