The more large Ukrainian units get destroyed/choose to surrender in the Donbass region, the more active Ukrainian artillery becomes, shelling civilian areas in Donetsk and other towns. This goes both for units that can hit Donetsk from long distance and for the Ukrainian artillery remnants that are still holed up inside DPR/LPR/Russian-controlled territory, using locals as human shields. Military equipment supplied to the Kiev-based regime by US and NATO is also being used in the shelling of Donetsk. The residents of Donetsk have suffered regular Ukrainian army shellings for 8 years, but they consider the current situation unprecedented, only comparable to the events of 2014-15. The people of Donetsk have grown used to the sounds of shells/rockets since 2014, and more or less know of their destructive capabilities. Now, unfamiliar US/NATO ammunition hits Donetsk (for example, civilians report that some types of shells fly quietly, so there's no time to take cover before they explode). Dozens of civilians were killed in Donetsk and other DPR/LPR towns in the last several weeks. Not that this is anything fundamentally new - Ukrainian army had been using heavy military equipment against civilians in Donbass since 2014. The current shellings seem to be aimed at forcing the residents of Donetsk and Luhansk to lose hope for a better future. However, those people didn't start the war. Unlike the Kiev-based radical nationalists, they never painted any nation as savage/subhuman; they never brought up their kids to hate their close neighbors - and never will. The people of Donetsk and Luhansk have never lost hope that the 8-year-long nightmare will end. They're certainly not willing to give up now
Shelling of the outskirts of Donetsk (15.06.2022)
Miner rescue station in Donetsk, damaged by the shelling (17.06.2022)
Shelling of Donetsk (17.06.2022)
Shells and rockets hitting blocks of flats in Donetsk (18.06.2022)
Aftermath of the shelling of the "ExpoDonbass" exhibition center in Donetsk (18.06.2022)
Aftermath of shells hitting the "Vishnevyi" ("Cherry") residential complex and a block of flats on the Vannikov St. (Kuibysevski district) in Donetsk today (20.06.2022)
Source: "Typical Donetsk", a group by & for Donetsk residents in VKontakte (a Russian social network)