I think if things get bad in Europe, then eventually some intelligence agencies could leak that it really was US that was behind the attack. This would create a political crisis in Europe, and might cause a split in NATO. Especially likely if US cuts and runs in Ukraine leaving Europe holding the bag.
So, now what? I mean the US is now shown it can basically do whatever it wants, even against European allies.
I think if things get bad in Europe, then eventually some intelligence agencies could leak that it really was US that was behind the attack. This would create a political crisis in Europe, and might cause a split in NATO. Especially likely if US cuts and runs in Ukraine leaving Europe holding the bag.
There is no honor among thieves.