Jake Sullivan: US will act ‘decisively’ if Russia uses nuclear weapons in Ukraine

US national security adviser says: Any use of nuclear weapons will be met with catastrophic consequences for Russia'

America and its allies will act decisively" if Russia uses a tactical nuclear weapon in Ukraine, US national security adviser Jake Sullivan said on Sunday, reaffirming the Joe Biden White House's previous response to mounting concerns that Vladimir Putin's threats are in increased danger of being realized.

We have communicated directly, privately and at very high levels to the Kremlin that any use of nuclear weapons will be met with catastrophic consequences for Russia, that the US and our allies will respond decisively, and we have been clear and specific about what that will entail," Sullivan told CBS's Face The Nation.