Ukraine prepared today for a “relentless defence” of Kyiv as the capital faced possible encirclement by Russian forces who also launched an airstrike on a military base outside the city of Lviv, near the Polish border. In a video address posted on social media late on Saturday night, President Volodymyr Zelensky was adamant that the Russians would not take Ukraine. “The Russian invaders cannot conquer us. They do not have such strength. They do not have such spirit. They are holding only on violence. Only on terror. Only on weapons, which they have a lot,” he said. Local officials said Russian…