Blinken and his UK counterpart Lammy to travel to Kiev this week

US Secretary of State Antony Blinken and his British counterpart David Lammy are travelling to Ukraine together this week, the two diplomats announced on Tuesday.

The two gave notice of their travel plans at a press conference on the fringes of Blinken's talks in London.

The joint trip comes at a critical time for Ukraine, said Blinken. Russia is intensifying its aggression against civilians, important infrastructure and the Ukrainian military, he added.

"We see it ramping up its attacks on cities, on people, in particular targeting the energy infrastructure, electricity all in advance of the coldest months," Blinken said.

The US secretary of state travelled to the British capital at the beginning of the week to discuss deepening cooperation with London. He also plans to meet British Prime Minister Keir Starmer, who is expected to visit Washington at the end of the week.