 He says this is all about putting pressure on the U.S. to say, be careful what you do. Don't go against our interests because we have this guy. Volker says it's a part of a larger package of Russian activities, including warships showing up in Cuba and going to North Korea to meet with Kim Jong-un. J.J. Green, WTOP News. The next hearing in Russia for Gershkovich has been set for August 13.