1. Released the same day as the announcement of formal Russian Sanctions
2. Released the same day US made 35 "diplomats" (aka. known Human Intelligence Officers) Persona Non Grata. Which is a big deal.
This type of document is not intended to "make the case" because we don't do that.
Making a case for something by definition, would reveal sources and methods which we highly guard. It also opens the administration up for scrutiny because there are many pieces which cannot be revealed because of classification - so it's impossibly to fully "make a case."
This type of report does however hint suggestively and point in the direction of support. They just let you put the pieces together.
In fact they don't have to put anything out and most people wouldn't even know to ask (outside of possibly FOIA, which won't go far in these cases).