US quietly planning potential responses in case Putin takes extreme step in Ukraine

Four days after Russia invaded Ukraine, President Joe Biden’s national security adviser Jake Sullivan authorized a team of officials to quietly map out potential ways the US could respond if Russian President Vladimir Putin took an extreme step, including deploying chemical, biological or nuclear weapons, a senior administration official told CNN.Four days after Russia invaded Ukraine, President Joe Biden’s national security adviser Jake Sullivan authorized a team of officials to quietly map out potential ways the US could respond if Russian President Vladimir Putin took an extreme step, including deploying chemical, biological or nuclear weapons, a senior administration official told CNN.