Ukraine's President Volodymyr Zelensky welcomes the Secretary-General Antonio Guterres to Kyiv on his third trip to the war-torn country since Russia's full-scale invasion. Guterres underlines the UN's position that Moscow's invasion of its pro-Western neighbour remains "a violation of the UN Charter and international law," whilst Zelensky reiterates calls for a "stop" to "Russia's nuclear blackmail". IMAGES AND SOUNDBITES