“Russian President Vladimir Putin has issued a stern warning that Russia may resort to nuclear weapons in response to an attack with conventional arms. During a televised Security Council meeting, Putin outlined revisions to Russia’s nuclear doctrine, stating that any assault by a non-nuclear power, if supported or aided by a nuclear nation, would be treated as a ‘joint attack on the Russian Federation.'”

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• Russia’s new Sarmat missile suffered ‘catastrophic failure’: Researchers

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• US imposes new sanctions on Iran over Albanian cyberattack

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• Russia’s Sarmat and China’s YJ-21: What the missile tests mean

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• New Russian missile will make enemies ‘think twice’, says Putin