Russia-Ukraine: What to know as Putin takes military action

Russian President Vladimir Putin has announced a military operation in Ukraine, and he is warning other countries that any attempt to interfere with the Russian action would lead to “consequences they have never seen.”

Russia sanctions: A look at Biden administration's toughest penalties

The East-West faceoff over Ukraine has escalated dramatically, with Russian lawmakers authorizing President Vladimir Putin to use military force outside his country and President Joe Biden and European leaders responding by slapping sanctions on Russian oligarchs and banks.

Explainer: Has Russia 'invaded' Ukraine?

When Russian President Vladimir Putin authorized troops to cross Ukraine's border into regions controlled by Russian-backed separatists, the White House initially stopped short of calling it an invasion. But not all invasions are viewed as equal.

Ukraine-Russia Crisis: Cyberattacks could affect U.S.

If Russia mounts cyberattacks against the United States, the targets could include banks, power plants, water treatment facilities, and communications. Those attacks could also impact GPS for navigation, farming, automation, and oil exploration.