I mean, everyone in Europe had doubt that anyone would respond to Hitler before he invaded Poland.

But when he invaded Poland, the world changed on a dime. I don't think there will be any daylight between any western nations now, when it comes to how to deal with Russia. You can't deal with a mad dog by giving it treats.

If there was any doubt before about NATO's mutual obligations, Putin has done away with that. Russia is about to become North Korea until one of Putin's close friends kills him. Which should take about six months.