That's not even close to what happened.
The administration left it alone for days saying they'll let private business sort it out. (Default investigation notwithstanding.)
When a bunch of news media started reporting the group was Russian and then insinuate it was a state sponsored attack, DarkSide said something along the lines of, "We didn't realize this would start geopolitical conflict. We will be careful to vet clients more carefully in the future."