Some media outlets mentioned Bosov's connection with Boris Berezovsky, with whom he supported Viktor Yushchenko and Yulia Tymoshenko during the campaign for the election of the President of Ukraine. Bosov himself denied this, stating that “...the only business I participated in with Berezovsky was the Internet company CityLine. He was the first to invest in it. The company was run by my friends Emelyan Zakharov, Demian Kudryavtsev and others. In 1999, they made me an offer to become a co-investor. In 2001 we sold the company and earned a decent amount of money”.