Ukrainian servicemen conduct air defence exercises in the north of the country as they prepare for further Russian strikes. "I think that they are building strength and then they will attack us en masse" says Sergiy, call sign “Lifter,” who is practicing his anti-aircraft gunner skills. Commander of the Joint Forces Serhiy Nayev, who is visiting the mobile air defence brigade training session believes that Ukraine needs more technologically advanced air defence systems. "We need weapons with a large destruction radius, such as the Patriot" he says, "now there is an agreement that such systems will soon come to us". IMAGES AND SOUNDBITES