I am aware of the controversy between the Trump Administration's potential ties with Russia, but people seem to be concerned specifically over the fact that the meeting occurred in the Oval Office.
Since the Oval Office is the official office of the POTUS, it's not unreasonable to assume that it is a reasonable place to meet with foreign dignitaries or ambassadors.
What is interesting about the fact that the meeting occurred in the Oval Office as opposed to some other place?