Comments by "Reecom98" (@reecom9884) on "Ukrainian tanks blow up Russian self-propelled mortar outside Donetsk" video.

That looks like the Soviet era 2S4 Tyulpan 240 mm self-propelled heavy mortar. It fires a heavy 240 mm mortar and takes a long time to aim, load and fire. The Russian soldier by himself was using a manual transit instrument to aim the Tylupan using landmarks, while the GPS aimed Ukrainian artillery had gotten the coordinates from the drone operator and was about to fire.
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@Smithy779 If you look at the barrel angle of 2S4 Tyulpan, the 240 mm mortar was trying to shoot over the mountain and using the side of the mountain to hide, forgetting he was fully out in the open for any drone to see overhead.
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