This is stated in the message of the office of the Ukrainian leader.
"The head of state informed the head of the British government about the aggravation of the situation in Donbass," the statement says.
It is clarified that Zelensky also called on the British side, together with other NATO states, to strengthen their presence in the region and increase the sanctions pressure on Russia.
Earlier, Russian President Vladimir Putin discussed the situation in eastern Ukraine with German Chancellor Angela Merkel and French leader Emmanuel Macron via videoconference.
In a conversation, Putin emphasized the importance of the Kiev authorities fulfilling all the agreements previously reached at the highest level.