18
Sep
Ukraine's generals say they have "broken through" Russia's first line of defence in the south. We've assessed how far Ukrainian forces have really progressed, and what signs there are of further breakthroughs along the frontline. Ukraine began its big counter-offensive in early June to push Russian forces back from land they seized. It attacked at three points along the 600-mile-plus (965km) frontline. The area to the south-east of the city of Zaporizhzhia is by far the most strategically important. Striking out in this direction towards the Sea of Azov, if successful, could cut off Russia's supply lines that connect the…