TCAS : what peekay4 says is absolutely correct technically , except that international Interception procedures require the first interceptor ( the one that comes close to the target ) to switch off his transponder just to avoid TCAS RAs from the aircraft intercepted
Hence:
Allegedly Venezuelan fighter jets already in flight on a routine mission decided to intercept the 787 but did not follow proper procedures and caused a TCAS RA.
From the data no vertical escape maneuver was performed, although that might only indicate that the crew was aware that they were being intercepted at that point.