In other words, the Pentagon doesn't have to find or shut down the Ukraine mafia sweatshop that's the source of a hack if the U.S. government can realistically threaten to bomb the bytes out of some valuable part of Ukraine if it doesn't shut the crackers down itself.
That's fine for grand cyber-powers who are more worried about losing their fighter jet than their kickbacks from the mafia.
It's less effective against China or Russia, which have more than one plane and more than one boat with which to resist or respond to a missile down the smokestack.
If this particular, sudden realization that the U.S. can be attacked online from overseas is an indication the U.S. military is going to coordinate and ramp up its own defenses and offensive capabilities – that's great.
It's 10 years late, but it's a great idea.
If it just means the Pentagon or someone in the current administration wants to create a way to saber-rattle in response to digital provocations as well as those in the physical world, it's a weak response that just barely acknowledges that cyberwar exists, let alone makes any progress toward defending against or winning one.