Amid reports that Russia is preparing to launch a major offensive, Ukrainian soldiers are monitoring the country's 1,000-kilometer border with Belarus to scour for signs of any military build-up on the other side. They are using reconnaissance drones several times a day to monitor the area. Ukrainian units are monitoring the 1,000-kilometer frontier of marsh and woodland for a possible surprise offensive. In the first phase of Ukraine War, Russia had invaded Ukraine from Belarus but the invasion failed and forces were redeployed to Eastern Ukraine within weeks.