Maybe Flynn was sending a mild signal, "Chill, don't worry about Obama's sanctions," but worried about Logan Act?
But why would he lie later when Trump had openly sent this Dec 30 tweet?
So Flynn probably was lying to cover up something much worse.
Bribery quid pro quo.
Check out the timeline here, especially Flynn/Kushner/Cohen for Dec. 2016 to Jan. 2017:
docs.google.com/document/d/1nR…