China on Tuesday swiftly retaliated against fresh U.S. tariffs, announcing hikes to import levies covering $21 billion worth of American agricultural and food products, moving the world's top two economies a step closer towards an all-out trade war.

For decades, Russia has been running a sophisticated operation designed to destabilize the United States and polarize its society.

ALT: two men in medieval costumes are walking through a field . one of the men is carrying a large sword .