LONDON (AP) — British Prime Minister Keir Starmer has rallied his European counterparts to shore up their borders and throw their full weight behind Ukraine as he announced outlines of a plan to end Russia’s war. “Every nation must contribute to that in the best way that it can, bringing different capabilities and support to the table, but all taking responsibility to act, all stepping up their own share of the burden,” he said. Starmer’s exhortation to 18 fellow leaders that they need to do the heavy lifting for their own security comes two days after U.S. backing of Ukraine appeared in jeopardy when President Donald Trump lashed out at Ukrainian President Volodymyr Zelenskyy.