Ukraine's front-line forces are trying to fight their way through Russia's formidable Surovikin Line. Here's what that is.

Tech Insider
A Ukrainian serviceman loads a shell into a mortar as he fires toward Russian troops at a position near the front line in the Zaporizhzhia region on Sept. 4, 2023.
A Ukrainian serviceman loads a shell into a mortar as he fires toward Russian troops at a position near the front line in the Zaporizhzhia region on Sept. 4, 2023.

REUTERS/Oleksandr Ratushniak

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