ERR reports the Baltic defense line project is already reshaping the southeast frontier.
Archived version: https://archive.is/newest/https://euromaidanpress.com/2025/09/16/estonia-is-digging-a-40-km-trench-to-stop-russian-tanks-and-600-bunkers-are-next/
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A tank driving on it will have issues. But this is easily overcome by itself.
This is just one small part of new emplacements. But even multiple layers are only expected to slow an advance