On the one thousandth day of Russia’s war in Ukraine this week there was a major shift on the battleground. 

Russia declared that Ukraine, with the backing of US President Joe Biden, had fired US-supplied missiles into its territory for the first time. 

Russia’s President Vladimir Putin has also unveiled new rules for his use of nuclear weapons. 

Today, former Ukraine ceasefire observer Samir Puri on what it means for the war. 

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Dr Samir Puri, former ceasefire observer in Ukraine, Associate Fellow at Chatham House and author of Westlessness: The Great Global Rebalancing