Russia's Shifting of Border Force Stirs U.S. Worry

By MARK LANDLER

The national security adviser, Susan E. Rice, expressed skepticism that troop movements on the border of southern and eastern Ukraine were merely training exercises.

As Sanctions Start, Russia Feels a Sting

By STEVEN LEE MYERS and NEIL MacFARQUHAR

With the onset of sanctions, Russia's stock indexes opened sharply lower and agencies threatened to cut the country's creditworthiness, but President Vladimir V. Putin's oligarchs stood by him.

Revelations of N.S.A. Spying Cost U.S. Tech Companies

By CLAIRE CAIN MILLER

America's cloud computing industry could lose billions of dollars in business because of the government's surveillance program.