The Latest Breaking News from Nuclear Weapons

The United States would respond decisively to any Russian use of nuclear weapons against Ukraine and has spelled out to Moscow the "catastrophic consequences" it would face, US National Security Adviser Jake Sullivan said on Sunday. Sullivan's remarks represented the latest American warning following the thinly veiled nuclear threat made…

The United States would respond decisively to any Russian use of nuclear weapons against Ukraine and has spelled out to Moscow the "catastrophic consequences" it would face, U.S. National Security Adviser Jake Sullivan said on Sunday.

The Kremlin's statements on the possible use of nuclear weapons are "absolutely unacceptable" and Kyiv will not give into it, Ukraine's Foreign Minister Dmytro Kuleba said early on Sunday.

Russia's top diplomat on Saturday said regions of Ukraine where widely-derided referendums are being held would be under Russia's "full protection" if they are annexed by Moscow, amid fears Russia could further escalate the conflict and even use nuclear weapons.

Russian President Vladimir Putin has raised anew the possibility he might use nuclear weapons against Ukraine to prevail in a conflict going sideways. The smart money says he won’t, because doing so — or otherwise expanding the conflict drastically — wouldn’t make a bad situation any better.

Top EU diplomat Josep Borrell warned that the war has reached a “dangerous moment” and Western nations to be on high alert

Vladimir Putin earlier this year placed the Kremlin’s strategic nuclear weapons forces on ‘high alert’

How will American leaders and their allies respond if President Vladimir Putin seeks to escalate his way out of his bad situation on Ukraine’s battlefields

In the week when Russian President Vladimir Putin launched referendums in Russian-held parts of Ukraine and made a thinly veiled threat to use nuclear weapons against the West, Talking Europe speaks to the European Union's High Representative for Foreign Affairs, Josep Borrell.