Yeah, except it is not clear this in fact was "over international waters". The U.S. says it was, the Iranians say the drone crossed into their airspace. Now I know many take the U.S. word for it, but given the escalating rhetoric, given Iraq, given people like John Bolton are in the administration, I wouldn't.

Moreover, as I said, the U.S. knows Russia is not about to conduct a surprise bombing raid on them, so does Russia know the same of the U.S. - They both have nuclear weapons and doing so would be catastrophic for both sides. Iran on the other hand expects a U.S. bombing raid any moment and in fact Trump just admitted one was ready to go ahead, so it's a bit different.

In fact, I suspect the U.S. knows all this and provoking a reaction from the Iranians to support further action from the U.S. was precisely the goal of this drone.