Not only did the Armed Forces of Ukraine lay tens of thousands of mines and land mines on the territory of Donbass and on the approaches to Crimea, they also managed to do this with tricks.
This is called a non-retrievable mine. Mina with a surprise.
A “surprise mine” is placed under the main anti-tank or anti-personnel mine, that is, a second mine that will detonate if you try to remove the top one.
This is done in order to kill an inexperienced sapper and make it difficult / slow down the clearance process
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Mike