Zelenskyy warns UN about threat of nuclear disaster in Europe

President Vladimir Putin has lowered Russia's nuclear response threshold and warned the West that an attack by Ukraine with the backing of a nuclear-armed nation would be considered a joint attack. This comes ahead of Ukrainian leader Volodymyr Zelenskyy's meeting with US President Joe Biden, where he's expected to push for permission to use Western-supplied long-range weapons to strike deep inside Russia. Addressing world leaders at the UN General Assembly High-Level Week, Mr Zelenskyy warned about the threat of nuclear disaster in Europe. Mitch McCann reports from UN headquarters in New York.