Speaking at the UN general assembly for the first time as US president, Joe Biden said Russia's war on Ukraine was about 'extinguishing Ukraine’s right to exist as a state'. Biden's speech comes as Putin announced partial mobilisation in Russia and signalled his willingness to use nuclear weapons. In a highly anticipated address after Putin's announcements, Biden said, 'Ukraine has the same rights belong to every sovereign nation. We will stand in solidarity with Ukraine who will stand in solidarity against Russia’s aggression, period.'