Euro leaders are terrified by this. Europe, which is supposed to have global parity with the big players, was just as much (maybe even more) of a paper tiger as Russia. But unlike Russia they have a big friend who has lots of money and lots of weapons.
For the average European who has only ever know life under the protective wing of NATO (read: America), this is just Tuesday. For the versed European leader, who needs to ensure their country can be safe if America goes away, it's totally harrowing. Even more harrowing when your population doesn't understand the need for defense.