It's actually been revealed today that as part of the HIMARS supply agreement to Ukraine, the US has veto on targets. Apparently what they're doing is that Ukraine intelligence comes up with target location lists, send them to US intelligence, US intelligence pulls and examines real time satellite data to see if the target contains anything they don't want Ukraine to hit - for example something in Russia, then they either veto the target on the list or ok it and Ukraine goes on to hit it by entering the location into the HIMARS computer.
Which means the US had no objection to Ukraine using HIMARS against bridges even though it's not a great use of the rockets.
And because the US has veto rights over target locations that can be entered into HIMARS computer, Russia is now saying this means the US is directly engaged in the war inside Ukraine. Which is obviously false, because there is a big difference between target Veto and target selection.