Britain is deeply concerned that Turkey plans to launch a military campaign in northern Syria, Prime Minister Boris Johnson's spokesman said on Tuesday.
Turkey said it had completed preparations for a military operation in northeast Syria after the United States began pulling back troops, opening the way for a Turkish attack on Kurdish-led forces long allied to Washington.
Asked about US President Donald Trump's comments that Britain was "thrilled" with his policy shift on Syria, Johnson's spokesman said US troop movements are a matter for the United States.