As the Armament Research Services website details, these are unexploded 9N235 fragmentation submunitions, deployed by 9M55K rockets, fired from the BM-30 Smerch and 220 mm 9M27K1 rockets for the BM-27 Uragan MLRS. Considering the remains of a nearby 9M55 series rocket, it seems very likely those rocket remains would be the 9M55K.
In addition to the remains of the rocket uploaded on February 12th, two photographs were posted online today that appear to show the remains of a large rocket motor
Thanks to Mads Dahl for highlighting the two images in this post.
You can contact the author on Twitter @brown_moses or by email at firstname.lastname@example.org.