The U.S. government will not participate in the St. Petersburg International Economic Forum, representative of U.S. administration told TASS.

The reason is Russia's approach to the Ukrainian crisis, that has become “more aggressive” as compared to the time of last year's forum, according to officials in Washington.

The St. Petersburg International. Economic Forum will be held on June 18-20 . According to Financial Times, heads of such companies as AT Kearney, Boston Consulting Group, PwC, Ernst & Young, Shell, BP, Societe Generale, Total, Schlumberger, JCDecaux, Metro and Carlsberg will attend the forum.