I get tons of Russian spam and have never been to Russia. Russia is quite literally the #1 source of spam globally: https://www.statista.com/statistics/263086/countries-of-orig...

If you had used the Gmail '+' trick on the address you used, you could have proven whether this was the case. If so, stopping any more of it would also be as easy as setting up a filter to delete all inbound email to that '+' variation.