Looks like Sessions may have been a plant from the start.
Indeed he was!
There has been research, several posted here, that discovered that neither Papadopoulos nor Page were participants in spying, collusion with Russia or any other attempts to undercut President Trump.
Rather they were both suckers, invited to participate in group meetings intended to make them look guilty of Russian collusion.
An example, though not one that is PC, would be if you were in a strange city and your host there invited you to meet him at a bar for a drink.
Later you see your name and photo as a celebrity patron of a gay bar.
Entrapment of this type is common, even in social events such as a party at the country club. Nodding your head or laughing at the wrong time can brand you as an agreeing participant in slanderous gossip.
And Papadopoulos is only a kid. Mix a kid, raging ambition and a few con men and you have the formula for tragedy.
The story is highly questionable at this point.