Rishi Sunak stepped up to the international stage last night taking calls from world leaders as he laid down the foundations for his premiership. Hours after his cabinet reshuffle, Mr Sunak took a call from US president Joe Biden (left inset) and discussed the war in Ukraine, as the US President called the UK his country's 'closest ally'. This was despite the president earlier mispronouncing the PM's name as 'Rashee Sanook' in his congratulatory speech. The new Prime Minister will meet Joe Biden in the coming weeks at the G20 summit in Indonesia. The PM also spoke with Ukrainian President Volodymyr Zelensky (bottom) and pledged the UK would continue to provide support as it defends itself from Russian aggression. Zelensky in turn invited Sunak to visit Ukraine. Yesterday, the PM also received congratulatory messages from other world leaders, including French President Emmanuel Macron (right inset), German Chancellor Olaf Scholz and Indian Prime Minister Narendra Modi. In his message to Mr Sunak, Mr Macron tweeted: 'Congratulations to Rishi Sunak, who has become Prime Minister of the United Kingdom. Together we will continue working to tackle the challenges of the moment, including the war in Ukraine and its many consequences for Europe and the world.' But not all reactions were quite as welcoming, with Russia acknowledging the new Prime Minister in frosty terms. Kremlin spokesman Dmitry Peskov said that in Moscow, 'we do not see any preconditions, grounds, or hope that in the foreseeable future there will be any positive changes' in the relationship between the United Kingdom and Russia.