Ukrainian President Volodymyr Zelenskyy and British Prime Minister Rishi Sunak held a phone conversation on Saturday on military support.
"We talked about further expanding the capabilities of the Ukrainian army, all-round support for Ukraine in the short & long term," Zelenskyy tweeted.
According to the Downing Street, the two leaders agreed on the importance of the international community speeding up assistance for Ukraine.
"The Prime Minister said he was focused on ensuring the UK's defensive military equipment reached the front line as quickly as possible," Sunak's office said in a statement.
"Both leaders agreed that it was vital that international partners accelerated their assistance to Ukraine to help seize the opportunity to push Russian forces back," the statement added.
(With input from Reuters)