British Prime Minister Keir Starmer , who on Monday announced he would resign, may not have been that popular with his British constituents lately, but he certainly had many friends among the European Union's top politicians. As European Commission President Ursula von der Leyen reacted to his resignation on Monday , she wrote: "European and Ukrainian security is stronger because of you. Thank you, dear Keir." French President Emmanuel Macron also expressed gratitude for Starmer's involvement