Wrong on both accounts.
The word "colluding" implies criminal conduct, and coordinating, consulting, or cooperating with a foreign is NOT at all illegal.
The main thing that is illegal about meeting with a foreign representative when campaigning, is if one accepts campaign contributions, which did not happen.
And NO, Russia is NOT invading a sovereign nation. Russia is punishing criminal acts by a nation that was created by a 1992 treaty, that the Ukraine violated. Technically then that treaty is void and the Ukraine is no longer independent or sovereign.