This was just released by the Russian MoD.
Russia’s MoD has just released a video showing a Sukhoi (Su-30SM) more or less “intercepting” a U.S. MQ-9 Reaper drone over Syria.
Although Russia and the US have agreed on coordinating their air activity in the skies over Syria, several close encounters between Sukhois and American jets and drones have occurred in the past weeks: as already reported Russian jets deployed to Latakia, tailed U.S. Predator drones on at least three separate occasions during the first week of the RuAF air campaign.
H/T @guidoolimpio for the heads-up