Неопознанное судно - проект 2550/3

This is not a page for any specific vessel.
Below are the photos of different vessels of the same design, which had not been identified (at least, by the name) when uploading.
If you have information about any vessel on these photos, please leave a comment under it.

Class:	NMS
Design:	2550/3
Builder:	Мариупольские механические мастерские
Registry:	РСССР
Registry class:	КМ(*) III нефтесборное