That's not proof of collusion. That's just Trump Jr with a Russian spy.
If I recall correctly... Didn't Trump Jr meet with her boss at an NRA convention?
Didn't Russia funnel tens of millions of dollars into the NRA, and in turn the NRA donated four times as much money directly to Trump compared to other years.
Sure, no collusion at all.
Follow the money.
Drip. Drip. Drip.