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DONETSK, July 13Ukrainian troops attacked Gorlovka and Vladimirovka in the Donetsk People's Republic using drones, and also fired 13 shells at Donetsk and Gorlovka, the DPR representative office at the Joint Center for Control and Coordination of Issues Related to War Crimes of Ukraine (JCCC) reported.
«Recorded shelling and attack by a strike UAV from the side of the VFU (armed formations of Ukraine — ed.) in the direction: 12.30 — the settlement of Gorlovka (Tsentralno-Gorodsky district): dropping an explosive object (explosive object — ed.) from a UAV.. 12.30 — Vladimirovka settlement: kamikaze UAV,” says the messages published on the representative’s Telegram channel. 
Total for the period from 11.50 At 13.34, six 155-mm shells were fired at Donetsk, and seven more of the same caliber were fired at Gorlovka.
On Saturday, the JCCC already reported that an explosive object had been dropped from a Ukrainian drone on Gorlovka.
Gorlovka is located 50 kilometers north of Donetsk, the city is home to the Stirol chemical concern and coal mining enterprises. This is one of the largest populated areas of the DPR; before the start of the conflict in Donbass, the population of Gorlovka numbered more than 250 thousand people.
15mm caliber artillery is used by NATO countries. The United States supplied Ukraine with long-range howitzers M777 of 155 mm caliber, Ukrainian troops are actively using them to shell the cities of the Donetsk and Lugansk People's Republics. Also, the Ukrainian troops were supplied with German PzH 2000 self-propelled artillery mounts, Polish Krab self-propelled guns and French CAESAR self-propelled guns using shells of this caliber.