I noticed that the general giving the Pentagon briefing to the press corps failed to answer a valid question from one of the assembled members of the 4th Estate. The question was along the lines of, 'Were any of the allied aircraft painted by Russian radar?'
Other questions focused on 'deconfliction'.
I would find it difficult to believe, given that the attack was telegraphed, that the Russians had no knowledge of the attack after it was in progress.
Could it be that they were content to let this, admittedly limited, attack succeed?