Ukraine

iirc from the last time it was posted these were 2S9 Nona self propelled mortars. The Russians are losing their main 152 mm self propelled artillery at a (for them) alarming rate, both from wear and tear of the barrels as well as losses from Ukrainian fire, so they have been forced to use these mortars more and more, but they have shorter range than the artillery and thus much more prone to counter artillery.