Perhaps the most important thing to keep in mind is that collusion is not itself a crime. Many people hear “collusion” and think about something akin to the legal concept of “conspiracy,” which is when two or more people agree to commit an illegal act. But there can be collusion that doesn’t involve law-breaking. Special Counsel Robert S. Mueller III is investigating crimes, and while we hope at the end of his investigation he’ll be able to provide a full picture of what kind of collusion there actually was, most of what we’ll be hearing from him — like the two indictments and one plea bargain deal that were made public yesterday — will be about crimes that were committed. He may not, at least in so many words, give us a final “yes” or “no” on whether there was collusion.

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Even if we find out that Donald Trump had daily phone calls with Vladimir Putin to chortle together about Hillary Clinton’s impending demise, it wouldn’t necessarily be a violation of any criminal code. It might be, but it wouldn’t always be. As Susan Hennessey and Benjamin Wittes point out, “There are plenty of activities that might be highly inappropriate and politically consequential but do not violate any criminal law.” It all depends on exactly what they’re colluding to do. If the Trump campaign was planning with them to commit illegal acts — like hacking into Democratic email accounts — then it would be a crime. As Bob Bauer notes, campaign finance law forbids foreign nationals from providing “anything of value” to a campaign, which could give prosecutors wide latitude to pursue a criminal case in connection with collusion.

But the point is that while you could have collusion that is criminal, you could also have collusion that didn’t violate the law, but would still be a grave political violation, one we’d demand to be addressed but that wouldn’t necessarily land anyone in jail.

That means that whatever “proof” of collusion we get may not result in something as definitive as a jury verdict. It will always be subject to interpretation and dispute, and President Trump will always have behind him a formidable media apparatus that will justify and excuse literally anything he does. If you doubt that, tune into Fox News for an hour or two. Every new revelation will be met with furious and desperate pushback from the White House, the conservative media and most Republicans in Congress, as they all insist that whatever the Trump campaign did was completely benign, it wasn’t collusion at all, and Hillary Clinton is the real villain. While in theory there is some action Trump might have taken that would cause his party and its media allies to abandon him in the way the GOP eventually abandoned Richard Nixon 43 years ago, in practice it just isn’t going to happen.

So what would collusion actually mean? It would mean that the Trump campaign and the Russian government (or its representatives) undertook some kind of common, cooperative effort to achieve their shared goal of undermining Hillary Clinton and helping Donald Trump.

The most generous interpretation of the campaign’s actions — at least the ones we’re aware of so far — would be that while they were well aware that the Russian government was trying to help them, and while there were some initial contacts between campaign representatives and people connected to or acting on behalf of the Kremlin, they never actually got around to working together in an ongoing way. They certainly can’t claim ignorance about Russia’s intentions, since by the summer of 2016 there had been substantial news coverage about Russian meddling. The candidates even argued about it in their final debate, during which Clinton challenged Trump to condemn Russia’s activities and reject their help, and he responded with “No puppet. You’re the puppet,” an argument of such eloquent subtlety that Republicans continue to use it to this day.

In any case, as of now, the strands of collusion are suggestive but hardly definitive. They paint a picture of people trying to arrange collusion, but not necessarily doing so. For instance:

George Papadopoulos was told in April 2016 by a source with contacts in Russia that the Russian government had “dirt” on Hillary Clinton consisting of “thousands of emails.” This occurred after Russian hackers had penetrated systems belonging to the DNC and Clinton’s campaign chair John Podesta, but before their emails had been publicly released through Wikileaks, which would happen in July. The documents released yesterday about Papadopoulos’s plea bargain did not say whether he shared that information with his superiors at the Trump campaign, but it would be shocking if he didn’t.

Paul Manafort, Jared Kushner and Donald Trump Jr. — essentially all the closest advisers to the candidate — took a meeting in June 2016 with a group of Russians whom they had been told had damaging information on Clinton to offer. They were also told in an email setting up the meeting that “This is obviously very high level and sensitive information but is part of Russia and its government’s support for Mr. Trump.” The lawyer who led the meeting brought with her a document whose content suggests that she was coordinating her activities with high-level Russian officials.

The head of Cambridge Analytica, the firm that did extensive data work for the Trump campaign and is funded by Republican mega-donor Robert Mercer, contacted Wikileaks leader Julian Assange during the campaign to see if they could together manage to acquire and publicly release thousands of personal emails Hillary Clinton had deleted, which would have required hacking into her system. During this time (and since), Wikileaks has for all intents and purposes been acting as an agent of the Russian government, but Assange says he rejected the request. You’ll recall that Trump publicly implored the Russian government to hack into Clinton’s email.

If nothing more is revealed from this day forward, we might be able to say there was no real collusion, even though the Russians were certainly interested in colluding (as evidenced by their repeated efforts to reach out to Trump campaign representatives) and the Trump campaign seemed interested in colluding if the Russians could offer them something useful. But does anyone really think that there are no more revelations to come?