Backgrounder: Lingering resentment over NATO’s expansion has strained U.S.-Russia relations.

Classic military unit groupings differ greatly in their specialization and size, and from country to country. Here is a basic look at how modern ground, naval, and air units break down in terms of si…

Trade relations between the United States and China have provided enormous benefits to both countries. But a growing U.S. trade deficit, China’s regulation of its currency, and concerns over intellec…

The Democrats now leading both houses of Congress will exercise strong influence on U.S. trade matters. Experts expect a slowdown in action on trade deals and a tough battle for renewal of the presid…