The point of advertising is to change people's behaviours and opinions. The entire purpose of the content is to modify behaviour. Cynics and trolls may think it doesn't have a 'significant' impact but it works which is why it is a multi-billion dollar industry.
Anyways, here is your evidence of the impact that Russian meddling had on the US elections, you troll https://www.dni.gov/files/documents/ICA_2017_01.pdf
It is impossible to know the full extent that Russian interference had on the election, but dismissing its impact because there is no proof of its 'effectiveness' is laughable. We know political ads work. It is why every single modern political campaign runs them. A google search gives you a rough idea of the reach this political campaign had. Put those simple principles together and you get why all western intelligence communities are in agreement that russia interfered and affected the US presidential election. Given how susceptible people are to advertising it shouldn't come as a surprise.
When someone posits a statement that is just insanely ignorant (and demonstrably wrong) like "I would even be satisfied with any ad from any country having the ability to significantly sway any election." then the intent to derail the conversation is clear. Any knowledge of political history (and advertising) would tell you that such a statement is clearly ridiculous. Being obstinate and a pedant doesn't make automatically make you a critical thinker. In this case, it blinds you from seeing the obvious.
Some sources for you even though you are probably too busy commenting something contrarian to google this shit yourself.
https://www.washingtonpost.com/opinions/without-the-russians...
https://www.nytimes.com/2017/10/30/technology/facebook-googl...