Russia

Some 30,000 troops from 20-plus nations took part in Europe's biggest military exercise since the Soviet Union collapsed. It was meant to send a message to Russia, but critics warn it could backfire.

In the 1980s, the FBI and NSA dug a tunnel for espionage purposes beneath the Soviet Embassy in Washington. The spy rivalry continues, but how has the game changed since the fall of the Soviet Union?

The DNC says the Russian hackers had access to its computer network for more than a year, viewing and stealing files.