The Russian leader also takes a dig at former UK prime minister Liz Truss and says he had to "emphasise certain things in response" to her remarks about being willing to authorise a British nuclear strike. Please use Chrome browser for a more accessible video player Vladimir Putin has said "we haven't gone mad" when asked about concerns he could use nuclear weapons in Ukraine - but didn't rule out a possible first-strike if threatened. The Russian president described the weapons as a deterrent, but reiterated his country would use "all the means at our disposal" to defend its interests if "peaceful means" were to fail. It is the latest in a number of statements since the start of the war in which he has kept open the nuclear option. Ukraine war latest: Belarus moves military gear after Kyiv's warnings it could join fighting "We haven't gone mad. We fully understand what nuclear weapons are," Mr Putin told a member of the presidential Human Rights Council in televised comments. "We have