Russian leaders responded flippantly Tuesday to the Trump administration’s threat of “severe” tariffs if Moscow doesn’t quickly come to a peace agreement with Ukraine. “Trump ...

Revisiting the Apollo-Soyuz mission could help us understand the purpose of science diplomacy and what can realistically be ...

Trump not ‘done’ with Putin, gives Russia a 50-day breather, cool on sanctions bill, Waltz U.N. confirmation on track.