When Marshal Ustinov arrived in Istanbul on 5th January, she had painted two red stars on her bridge indicating that this ship was awarded for excellence.
А for artillery and ПВО for anti-aircraft. As shown below:
However, a third star was painted overnight, as it was visible during her aborted berthing maneuver on 6th January 2019.
Interesting to note that all these photos are from the starboard side of the ship. I was not able to see the port side of the ship until she passed through the Bosphorus to return home.
And when she was returning back to Russia on 8th January, oddly enough she had only two stars painted on her port side.
If I had to guess why there is not a third star on the port side of the ship I would say the information for the award arrived from the naval headquarters when the ship was already sailing towards Istanbul and the bosun has only enough red paint to paint on the one side of the bridge.
devrimyaylali.com 
Brilliant detail and comment !