"Russia is seeking to collaborate with Iran in areas like weapons development, training," he said, adding that the US fears that Russia intended to "provide Iran with advanced military components" including helicopters and air defence systems."Russia's been using Iranian drones to strike energy infrastructure, depriving millions of Ukrainians of power, heat, critical services.In response to Mr Kirby's comments, UK Foreign Secretary James Cleverly said that Iran had become one of Russia's main military supporters and that the relationship between them was threatening global security.In other developments:- Russia has turned the Ukrainian city of Bakhmut into "burnt ruins", President Zelensky says, following months of deadly fighting in the eastern Donbas region- The United Nations says Belarus will allow the transit of Ukrainian grain through its territory for export from Lithuanian ports- The head of a Ukrainian human rights organisation that was jointly awarded this year's Nobel Peace Prize - Oleksandra Matviichuk of the Centre for Civil Liberties - has called on nations to set up an international tribunal to try Russian President Vladimir Putin for Russia's war in Ukraine- Russian human rights activist Yan Rachinsky, from the organisation Memorial which was also awarded this year's accolade, has told the BBC he was ordered to turn down the prize by Russian authorities.- The International Olympic Committee says it will explore a proposal to allow athletes from Russia and Belarus to take part in sporting events in Asia - despite an international ban"