Yes, Russian fighter jets, like many modern military aircraft, are equipped with fuel jettison systems that allow them to dump fuel in flight. This is primarily a safety feature used to reduce the aircraft's weight for an emergency landing (to meet "maximum landing weight" limits) or to increase maneuverability in combat. However, this capability gained global notoriety in March 2023, when a Russian Su-27 Flanker was recorded by a U.S. MQ-9 Reaper drone dumping fuel directly onto the drone over the Black Sea. The maneuver was interpreted as a "non-kinetic" form of aggression, intended to foul the drone's sensors and engine. Most Russian fighters, including the Su-27, Su-30, and the newer Su-57, have these "venting" nozzles typically located near the rear of the aircraft or on the wingtips. While fuel dumping is a standard technical procedure in aviation, its use as a tactical tool for "harassment" of other aircraft highlights the versatility of the system beyond its original engineering purpose of managing the plane's center of gravity and landing safety.