Dragons claimed their first win in Pool 1 with a 28-21 success at bottom side Enisei-STM.
Captain Cory Hill, Jared Rosser, Hallam Amos and Charlie Davies all scored tries for the visitors, who wrapped up a try bonus point.
However, Dragons were made to hold on for the victory when Anton Rudoy's late try was converted by Yury Kushnarev.
Siya Masuku kicked 21 points and controlled the game masterfully from flyhalf as South Africa's Sharks defeated Gloucester 36-22 in the final of the European Challenge Cup at the Tottenham Hotspur Stadium on Friday.
Juan Pablo Socino will miss Newcastle Falcons' opening European Challenge Cup fixtures after being handed a two-week suspension by the RFU's disciplinary panel.
Edinburgh edged past Harlequins 36-35 in thrilling encounter in the European Challenge Cup.
Rhys Priestland kicked five penalties as Bath recorded a 22-6 victory over Bristol in Pool 4 of the European Rugby Challenge Cup.
With Bath and Bristol set to reignite their rivalry after seven years away, ESPN runs down five classic clashes between the west country rivals.
Edinburgh got their Challenge Cup campaign off to a perfect start with a 59-17 win over Romanian side Timisoara Saracens.
