Russia says it destroyed S-300 missile launchers days after US helped provide them
The Russian military says it used sea-launched Kalibr cruise missiles to destroy four S-300 air defense missile launchers near the city of Dnipro, just days after Slovakia sent Ukraine an S-300 air defense system in a deal worked out by the U.S.
http://www.msn.com/en-us/news/world/russia-says-it-destroyed-s-300-missile-launchers-days-after-us-helped-provide-them-live-ukraine-updates/ar-AAW5cjy?ocid=BingNews
...sounds like a leak in the system to me.