List of threats

Russian military activity is at its highest level since the Cold War, destructive state-sponsored attacks on U.S. computer systems are on the rise and Islamic State is expanding into unstable parts of North Africa, the Pentagon's top intelligence official told Congress on Tuesday.

The warnings came against the grim backdrop of the release of a video that appeared to show a Jordanian military pilot being burned alive by his Islamic State captors, and a day after President Obama proposed reversing a five-year decline in military spending to help battle the Sunni Muslim extremists who control parts of Iraq and Syria.

Pentagon official lists militants, Russia and China as threats to U.S.