Lviv has introduced an emergency preparedness regime due to the possibility of a Russian attack amid severe frosts. Lviv Mayor Andriy Sadovyi announced this on Facebook, Ukrinform reports. He noted that meteorologists are forecasting severe frost for the coming weekend, which could be stronger than the previous cold spell. Therefore, Lviv has entered a state of emergency preparedness, the mayor reported. Sadovyi stressed that people should trust only official sources of information.