WARSAW, Poland — As President Donald Trump declared that “America First does not mean America alone” at a global economic forum in Switzerland, his top diplomat was on a European trip of his own, trying to convince skeptical allies that the oft-repeated phrase is more than just lip service.

Yet a year into Trump’s presidency, his administration has demonstrated that “America First” may, indeed, mean “America alone,” though it remains unclear if that has helped Secretary of State Rex Tillerson’s bargaining position on crucial national security and foreign policy matters.

Amid crises in multiple hotspots and before joining Trump at the World Economic Forum in Davos, Tillerson visited London and Paris with a full agenda aimed at defusing not only the issues at hand but also tensions with Washington.

His mission was primarily to secure British and French support for tough new measures against Iran that might prevent the U.S. from withdrawing from the 2015 nuclear accord. Along the way, he also accused Russia of responsibility for chemical weapons attacks in Syria and chastised Turkey for attacking U.S.-backed Kurd forces there.