The UK will provide Ukraine with classified technical information needed to assemble long-range cruise missiles domestically.

Prime Minister Andy Burnham is set to announce the move during a visit to Kiev on Monday, his first international trip since taking office last month.

According to a Downing Street press release published on Sunday, the British government has authorized European defense manufacturer MBDA to release classified information concerning UK-made components for SCALP, the French-produced version of Britain’s Storm Shadow. The air-launched missiles use shared French and British technology and have a range exceeding 250 kilometers.

Kiev and Paris are seeking to establish local production lines on Ukrainian territory. Britain says its decision will allow “the French and Ukrainians to move forward with the Ukrainian assembly of the missile.”

“The Ukrainian people should be in no doubt: The UK is behind you today and for as long as it takes,” Burnham said, echoing the position of previous governments.

During his visit, Burnham is expected to meet Ukrainian leader Vladimir Zelensky and chair his first meeting of the so-called Coalition of the Willing, established by Britain and France under his predecessor, Keir Starmer.

Moscow has maintained that the UK and other suppliers of weapons to Kiev are directly responsible for Ukraine’s deep-strike campaign, which it says has frequently hit civilians.

According to The Sunday Times, drones manufactured by BAE Systems and another unnamed British company have been used to hit targets in Russia over the past six months, including two oil refineries. The UAVs reportedly included the Nyan, a jet-powered drone produced by a BAE Systems subsidiary.

In a statement last week, the Russian Embassy in London branded the UK “an accomplice and co-perpetrator of the bloody crimes and terrorist attacks” committed by Ukraine. It warned that “the deeper its involvement in the conflict and the greater its support for Kiev’s terrorist machinery, the higher the price it will pay.”

Russian Foreign Minister Sergey Lavrov has warned that London will face consequences if it continues supplying drones used by Ukraine for strikes deep inside Russia.

“We have every right to regard the proudly proclaimed direct involvement of British missile forces in strikes against Russia as participation in the war, with all the consequences that entails,” Lavrov said.