There's nothing there that warrants the spying that took place. They talked about setting up a meeting to discuss, mostly, Middle East affairs. We already know Flynn is as anti-radical Islam as it gets, having spent a decade in the belly of the beast. The whole "don't box me in" thing, I took, as meaning 'I can't commit to meeting at this point, so don't promise Vlad anything just yet.'
But I could be wrong.