British media reported that the country, behind closed doors, gave Ukraine the green light to use its Storm Shadow missiles to strike deep into Russian territory as Moscow troops again targeted energy facilities and civilian infrastructure in northeastern Ukraine overnight, wounding at least 14 people.
According to the Guardian, government sources said a decision had already been made to allow Kiev to use British-made cruise missiles inside Russia.
The move was not announced and is unlikely to be made public even when British Prime Minister Keir Starmer meets US President Joe Biden in Washington on September 13.
British officials have not confirmed the Guardian's report.
For months, Ukrainian President Volodymyr Zelenskyy has pleaded with Kiev's allies to allow Ukraine to fire Western weapons, including long-range US ATACMS and British Storm Shadows, deep into Russian territory to limit Moscow's ability to launch attacks.
Biden said earlier this week that his administration was figuring out a way to lift the restrictions, though he did not provide any details.
Meanwhile, Secretary of State Anthony Blinken strongly hinted during a trip to Kiev on September 11 that the White House is close to deciding to lift restrictions on the use of its long-range weapons.
"We are working urgently to ensure that Ukraine has what it needs to defend itself effectively," he told a news conference after a meeting with British Foreign Secretary David Lammy and Ukrainian Foreign Minister Andriy Sibih.
Blinken and Lami left Ukraine after meeting with Ukrainian officials in Kiev and announcing a new aid package.
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