David Cameron (pictured) last night vowed Russia 'must be made to pay' as he confronted Moscow's foreign minister over the invasion of Ukraine and death of Alexei Navalny. 

The Foreign Secretary used a G20 meeting in Rio to challenge Sergey Lavrov (pictured) over the Kremlin's ongoing war and 'murder' of an opposition leader.

The stormy meeting also saw the US, Australia, Canada, Germany, Italy, France and Norway call out Russia. Mr Lavrov, known as Russian President Vladimir Putin 's attack dog, is said to have hit back at Western 'fabrication' over the death of Mr Navalny. He was also mocked for setting out an 'alternative set of facts' about events in Ukraine.

Lord Cameron's address to G20 foreign ministers came shortly after Britain slapped sanctions on the chiefs of the Arctic penal colony where Mr Navalny was killed. 'Russia must be made to pay for its aggression,' the Foreign Secretary told the summit. 'There is no more serious an issue for the world, and it's the world that's gathered here, than one country invading another in this completely illegal and unacceptable way. And the whole world should get behind Ukraine, should support Ukraine, and should call out the illegality of what Putin and his cronies have done.'

According to the BBC, Lord Cameron was joined by foreign ministers from France, Canada and Germany in naming Mr Navalny and blaming Russia for his 'murder' in front of Mr Lavrov. The Kremlin politician was reported to have looked away and at his phone, before using his own speech to deny allegations of murder and calling them a 'fabrication'. Norway's foreign minister Espen Barth Eide said Mr Lavrov replied to Lord Cameron's remarks with 'a set of alternative facts' about events in Ukraine.

Mr Navalny, 47, is said to have fallen unconscious and died suddenly on Friday after a walk at the penal colony where he was serving a three-decade sentence. Those in charge of his detention in the brutal prison camp were yesterday hit with asset freezes and travel bans by Britain.

The death of the vociferous Kremlin opponent occurred at the remote IK-3 prison - known as 'Polar Wolf' - in the Arctic Circle. The Foreign Office pointed to the barbaric treatment of Mr Navalny, who spent his life to exposing corruption by Mr Putin's regime, while being held as a political prisoner.

He was kept in solitary confinement for up to two weeks at a time, denied medical treatment, and forced to walk in -32C weather while detained at the penal colony.

The Foreign Office named six sanctioned individuals as Colonel Vadim Konstantinovich Kalinin, the head of the 'Polar Wolf' penal colony, as well as five deputy heads Sergey Korzhov, Vasily Vydrin, Vladimir Pilipchik, Aleksandr Golyakov, and Aleksandr Obraztsov. The six men are now banned from Britain and subject to an asset freeze preventing UK companies and individuals from dealing with them.

Senior Conservative MP Alicia Kearns warned the action being taken by Britain in response to Mr Navalny's killing was not yet tough enough. 'We need to go further than this. A lot further,' said the chair of the House of Commons foreign affairs committee.

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