Our leaders are morons.
No, it couldn't.
That isn't how the Internet works.
The Internet was designed to have MULTIPLE hubs destroyed before there is a loss of services. It was designed to survive a nuclear war. Just cutting the trans Atlantic cables would do nothing to our access or communications. Nothing.
This either shows how incredibly ignorant our leadership is or demonstrates how much they are willing to lie in order to demonize Russia.
Probably both.