The “Surovikin Line” refers to the massive defensive fortifications built by Russian forces in 2023 on occupied Ukrainian territory.
From: Euromaiden Press BY EUHENIIA MARTYNIUK

Ukraine has created over 600 miles (965 kilometers) of new fortifications along the front line, reports the British newspaper The Telegraph. These include trenches, concrete “dragon’s teeth” tank traps, and underground command centers.
The large-scale construction of new defensive lines marks a shift from promises of a major offensive in 2023 to a strategy of active defense in 2024.
The new fortifications are located in Donetsk Oblast near the towns of Lyman and Avdiivka, in Kharkiv Oblast near Kupiansk, and in the north along the Russian and Belarusian borders. Kyiv has boosted its defenses in the north by 63%, according to a Reuters report.