Russian President Vladimir Putin's non-participation in the nuclear summit in Washington is due to the lack of mutual action during preliminary preparation, Kremlin spokesman Dmitry Peskov said Wednesday. 
"The issue of nuclear safety is an important one, however, Moscow believes that the study of the issues related to nuclear safety requires common and joint efforts and mutual consideration of interests and positions in the course of the preliminary work. We experienced a clear deficit in the preliminary study of the issues and topics of the summit, so in this case there will be no participation of the Russian side," Peskov told journalists.

Source: QNA