The advanced U.S. fighter aircraft will mark a significant upgrade to Ukraine’s air force, but their impact on the war with Russia will hinge on several factors.

Japanese Prime Minister Kishida Fumio’s Washington summit on April 11 comes at a time of deepening security cooperation as well as some challenges to economic ties.

Governments and companies are embracing new emissions-reducing technologies that pull carbon dioxide out of the atmosphere. But it is uncertain whether this can work at the scale and in the time nece…

The country’s steady military and technological progress, coupled with its leader Kim Jong Un’s increased hostility toward foreign influences, raises concern about Pyongyang’s ambitions. Here’s a bre…