Why Russia's Ukraine aggression matters to Americans

Nobody knows for sure exactly what Vladimir Putin is doing with around 100,000 Russian troops parked near the Russia-Ukraine border, but it's making the US and Europe extremely nervous.

President Joe Biden said this week he expected the Russians would "move in" and that a slight incursion would be met differently than a full-on invasion.

The US has spent the past few days cleaning up that remark and making clear any type of invasion is unacceptable.

Asked in Geneva by a reporter if he thought, like Biden, that an invasion was likely, Russian Foreign...