The spokesperson added: “Discussing the lead up to the one year anniversary of Russia’s unprovoked invasion of Ukraine, both leaders agreed on the importance of UN partners once again demonstrating their solidarity with Ukraine.”
The official added that the two leaders have agreed to “stay in close touch”.
Mr Sunak has continued to fervently back Ukraine since taking over from Liz Truss last year, having confirmed the country will receive British tanks.
The Government will ship 12 Challenger 2 tanks to the Ukrainian front, joining others from the US and Germany that officials believe could change the tide of war.