The US senator Lindsey Graham, a close ally of Donald Trump, is expected to brief European leaders on Thursday in Antalya on his plans to push through Congress sanctions designed to devastate the Russian economy if Vladimir Putin does not show a willingness to negotiate the future of Ukraine in good faith.
Graham is due to meet European foreign ministers, including the UK foreign secretary, David Lammy, in Turkey where they had gathered on Wednesday for a long-scheduled informal two-day Nato meeting.
