Two sides of the story.
Venezuelan reports say the Avianca 787 had an ADS-B malfunction over Venezuelan airspace and as a result Venezuela scrambled two SU-30s to intercept the aircraft.
Colombian reports say there was no transponder malfunction and the 787 was in normal contact with Venezuelan ATC. 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. The intercept continued for four minutes, and ended shortly before the 787 entered Colombian airspace.