The only silver lining here is that it is hardly a surprise to the Russians that they are at war with the US. They have known all along who is on the other side of the line. The only people who might be surprised live within the US itself. The administration will gain nothing for this politically. Those who support them will cheer, but they would cheer anyway; those who are against the administration's handling of this are going to be even more pissed than they were before; and those in the middle are going to find this a dangerous escalation. Net loss that they have told the world what the Russians already knew.

Failing empires just keep waging war. It's the only thing they have left.