Boris Johnson told Sky News he does not think Vladimir Putin will use a tactical nuclear weapon in his war in Ukraine as it would be a "total disaster" for Russia - but said if there was an attack, the West would have to react. Security and Defence Editor @haynesdeborah He may be a former British prime minister, but any comment made by Boris Johnson on the war in Ukraine still carries weight, especially when it comes to nuclear weapons. His uniquely close relationship with Ukrainian President Volodymyr Zelenskyy and his decision to be a leading voice amongst Western allies in supporting Ukraine from the outset of the invasion has made London one of Kyiv's most trusted and valued partners. It also gave Mr Johnson privileged access during his time in office to the private thoughts of Mr Zelenskyy as well as a deep understanding of Ukraine's need to defeat Russia's invasion and the threats it could face - all the way up to Vladimir Putin launching a nuclear strike. Putin's hands 'may prov