Private citizens are not supposed to conduct foreign policy in the name of the United States, although this has never been prosecuted.
Perhaps because in nearly every instance except one, the private citizen was attempting, however ineptly, to support the policy of the government. That was the case, for example, when Bishop Walsh attempted to negotiate with the government of Japan for an end to hostilities in Asia.That was Roosevelt's policy, too, and Walsh was not prosecuted.
The one case we all know of when a private citizen attempted to torpedo the policy of the government was when Flynn, acting for private citizen Trump, advised the government of Russia not to pay any attention to sanctions designed by the government of the United States to influence Russian policy in third countries (Ukraine).
Not treason, according to the very narrow definition in the Constitution, but treachery.
Open and shut case, really, and now we know, via Foreign Policy magazine, that that is just what happened and that the guilty parties knew they were guilty and the other Trump advisers knew, too, and worked to cover it up.
Obstruction? Yes. Collusion? yes.
Kind of stupid, when you think about it. You could call it the shallow state.
And it goes far back and involves advisers to Trump who were also family.
A further point. The initial attempts to destroy the effectiveness of government policy need not have been successful in order to be criminous. People go to prison for long terms all the time for attempting to break the law without ever committing the violation they were attempting.
It's called conspiracy.