For the Russian data because A - They are being awkward, B - They don't want any analysis done on the primary shadows shown in their video (that are AIUI likely to be fragments of MH17). (Although their claim is that they do a spatial save, only retaining data from within their territory and filter out data outside their territory - which seems like an improbable effort to have gone to to save a bit of storage cost).
For the Ukranian data, they said their primary Radars in the area were down for maintenance and they were using only secondary data, hence there is no ATC data (section 2.9.5.2). The Ukrainians also claim not to have military primary radar data due because they were not operating their military Radar as they had no military aircraft in the area (same section).