If Russia really did buy thousands of ads on places such as various social media networks, then Russia basically wasted a bunch of money....because "Political ads have no real effect on changing anyone's opinion."
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The election campaign involves the accumulation of hundreds and thousands of political and social ads, campaign speeches, news stories and commentaries about those speeches, news stories and commentaries about the candidates and the issues, and ads, ads, and more ads coming from all the candidates, all the political parties, all the political action committees, all the non-political action committees, and all the opinions of your family, your friends, your co-workers.....so much so that even "political ads from Russia" will not alter your basic beliefs about a candidate or an issue one iota. Not one iota. 
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If Russia bought ads, Russia wasted their money.
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This comment may - may - have more of an effect on anyone's opinion than "Russian ads" ever could have and ever will.