WASHINGTON (AP) — A military coup in Myanmar and a mass crackdown on dissidents in Russia are presenting early tests for the Biden administration as it tries to reestablish American primacy as a worldwide pro-democracy leader. President Joe Biden and his nascent foreign policy team have been confronted with two serious challenges in two parts of the world. The U.S. has invested decades of time, energy and money into promoting democracy in both Myanmar and Russia but now faces challenges in each that could affect the global balance of power. Yet, the tools at its disposal — sanctions — have proved unreliable in prompting change in the past.