Several world leaders, including U.S. President Joe Biden and Ukraine’s President Volodymyr Zelenskyy, have lauded Rishi Sunak becoming the U.K.’s new Prime Minister as a “ground-breaking milestone” and hoped for better bilateral relations amidst a turbulent world.Sunak, 42, on Monday, won the race to lead the Conservative Party and became Britain’s first prime minister of Indian-origin on Tuesday.