A message about this action, prohibited by international conventions, appeared in the media on February 18. The very use of poisonous substances (PS) was made on February 16.
According to the interlocutor of the agency, on the morning of February 16, two attack copters of the Armed Forces of Ukraine appeared over the positions of Russian troops near Ugledar. One of them was shot down, and the second one dropped chemical ammunition on the positions of the Russian troops.