Morning mail: UN issues warning about Ukraine, more rain in NSW, Shane Warne’s last moments

Monday: Invasion creating fastest-growing refugee crisis since the second world war. Plus: Scott Morrison pledges new base for nuclear-powered submarines on Australia's east coast

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Good morning. Ukraine has the fastest-growing refugee crisis since the second world war, the United Nations has said, as war crimes investigators begin collecting evidence. Scott Morrison is expected to warn of a new arc of autocracy" shaping the world. And weather warnings continue in NSW, with more heavy rainfall in parts.

The Russian invasion of Ukraine has triggered the fastest-growing refugee crisis in Europe since the second world war, according to the UN refugee agency. The warning came as eyewitnesses described an incident in which three people trying to escape fighting in Irpin, just outside Kyiv, were killed when they were shelled by Russian forces during an organised evacuation on Sunday. With more than 1.5 million refugees from Ukraine reported to have crossed into neighbouring countries in the space of 10 days, the UN high commissioner for refugees, Filippo Grandi, warned the situation would only get worse. A second attempt to evacuate hundreds of thousands of people from the encircled port city of Mariupol appears close to collapse after Ukraine's national guard accused Russia of continuing to shell the humanitarian corridors.