The active phase of the EU-CHEM-REACT-2 exercise began on 28 September. Thus, according to the scenario, at 8:00 am, a request was submitted to the SES of Ukraine and the Cabinet of Ministers of Ukraine to provide assistance and to send units to eliminate the emergency situation. In response to a request for assistance international experts arrived at the site of the disaster (a landfill near Yavoriv Lake in Lviv region) and began to work to assist the injured party. In the process of liquidation of the emergency, the emergency response headquarters, the TEB commission and the international headquarters of OSOCC worked.