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Dear wikipedians, I'm after verifiable sources to support the content in this article, and to further expand it. Any help will be greatly appreciated. Regards, DPdH ( talk) 12:22, 27 September 2016 (UTC) reply

It would be good to see this expanded. You'd think such a key concept would have more sources... -- _{Piotr Konieczny aka Prokonsul Piotrus| reply here} 08:02, 28 September 2016 (UTC) reply

Ukraine war Andriivka Ukrainian defense line Defense line installation 223.39.193.6 ( talk) 23:36, 26 September 2023 (UTC) reply