WASHINGTON - When the White House discovered in recent weeks that its unclassified computer systems had been breached, intelligence officials examined the digital evidence and focused on a prime suspect: Russia, which they believe is using its highly sophisticated cyber capabilities to test American defenses. But its tracks were well covered, and officials say they may never know for sure.
Russia's War Against Ukraine
New York Times: New Russian boldness revives a Cold War tradition – testing the other side
A man passes by a piece of the Berlin Wall installed in front of the Andrei Sakharov Memorial Center in Moscow on July 14, 2014.
