(CNN) — President Donald Trump said Tuesday that Ukraine could restore its borders from before Russia’s invasion and that he believes NATO member countries should shoot down Russian aircraft if they ...

Russia not close to encirclement of Kupiansk in Kharkiv Oblast despite claims, expert says U.S. President Donald Trump said on Sept. 23 that NATO countries should shoot down Russian aircraft that ...

Air power may have proved lethally effective during the First World War, but the technology was still in its infancy. By 1939, however, European air forces as well as North American and Asian powers ...