As Ukraine prepares to launch its much anticipated counteroffensive on Russian forces, satellite images and videos show how Moscow has been strengthening its defense lines. British intelligence says Russia has built some of the most extensive defenses anywhere in the world with their anti-tank ditches, Dragon’s teeth and trenches. WSJ looks at the effectiveness of the Russian defenses to understand what Ukrainian troops could face in their offensive. 0:00 Satellite images of defense 0:52 Digging defensive lines 1:27 Defensive lines, explained 2:38 Effectiveness of defense Russia-Ukraine Conflict WSJ’s latest news coverage around the 2022-2023 Russia-Ukraine conflict. #Ukraine #Russia #WSJ