According to m-1global.com:
M-1 Global welterweight Magomed Shikshabekov (6-0) was scheduled to make his STRIKEFORCE debut as part of the preliminary card.
Due to circumstances beyond the control of the fighter or M-1 Global, that visa will not be obtained in time for Shikshabekov to participate on the June 26th card.
M-1 will diligently work to obtain the appropriate P-1 visa for The Eagle and hopes to see him fighting in the United States before the end of 2010.