The White House said it did not support Ukraine launching attacks inside Russia after two drones from Ukraine damaged buildings in Moscow earlier on Monday.
The US may not back them, but it certainly doesn't condemn them either. This is the tightrope that has been walked between the nuclear-armed parties of interest since the beginning of the conflict.
Of course they don't, they aren't interested in a decisive Ukrainian win. The US would be ecstatic if this war lasted a decade with Russia being stuck in a no win situation.
I get that they are trying to do the "war isn't so far from home" thing but it is a delicate balance to strike...as Ukraine well knows, an attack near your home is more likely to strengthen your resolve against the country that just attacked you.