Not only is it fully legal for a transition team to work with other state leaders, but in fact the Obama administration explicitly stated in no uncertain terms that they don’t have any problem with it:
This video has been going around showing this: https://m.youtube.com/watch?v=2vO3GNexHYI&t=28m25s
Obviously Flynn pleading guilty to lying IS genuine news, but we’ll have to wait and see exactly what it entails. But make no mistake: This news article made TWO huge claims of news events, and you can see them even in the title of the article. One wasn’t just wrong, it bore the exact opposite message of reality (Trump campaign subverting Obama’s authority, vs the incoming Trump administration working with foreign leaders under the direct blessing of the Obama administration).
I’m not here to defend Trump or Flynn or anyone else, except advocate for the apparently crumbling notion of journliastic integrity. It’s sad how little of it remains. If you want to see Trump impeached, by all means we should continue investigating and bring to light facts. But please, it is important to get the facts right.
But this was never really about violating that particular law, which is called the Logan Act. No one has ever been prosecuted for violating it. This is about the fact that Flynn lied about the meeting. This is not in dispute, not even by the Trump administration. So... why did Flynn lie? We don't yet know. But Robert Mueller does.