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- On May 22, Russia reported that Idlib militants violated the ceasefire regime in Greater Idlib 5 times: 1 – in Idlib province, 3 – in Latakia province, 1 – in Aleppo province;
- On May 21, a member of SAA 4th Division was killed by unknown gunmen in the town of Jassim in Daraa provine;
- On May 21, Russian warplanes attacked ISIS hideouts in the Sukhnah desert;
- On May 21, two SAA members reportedly were killed by ISIS attack near Rasafa;
- On May 21, artillery of Turkish-backed forces shelled SDF positions near Tal Tamar.