Russia sent in its troops and armed its terrorist proxies who burned polling places, burned ballots, threatened anyone who tried to vote, tried to rig votes, and even bragged about doing all of the above by recording their goings on.
Considering the amount of groveling Trump is doing at Putin's feet for his own personal gain and has openly asked for the same foreign government to commit espionage on a U.S. citizen, it would be surprising if Russia wasn't trying to game the system. So long as Putin has been in power that has been the name of game in Russia: only those Putin approves are allowed to run for office.
That Russia is now trying to electronically influence U.S. elections only shows how desperate Putin is to have the sanctions lifted which are dragging his country down each day they are in place. As reported a week ago, Russia will literally run out of money by the middle of next year if sanctions aren't lifted. Supporting the terrorists in Eastern Ukraine and the Syrian regime is costing Russia money it can ill-afford to lose yet from all appearances, Putin is vowed and determined to drag Russia down with him. That is why they are attempting to interfere in U.S. elections.