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From previous articles about this, they won't be deployed now. They will be deployed if needed.

If you placed those mines just in case, would wildlife not trigger one from time to time? How long until they would be mostly gone? And how long do they survive in the wild until they become unreliable or dangerous to handle? How hard would it be to replace or remove them if no longer needed?

Depends on your mine. Some are now programed to explode after say three months to avoid the problem of them being a threat for a long time. A lot get laid just in time by drones rather than staying there for ages.

A certain percent will fail to detonate automatically, so the area will still be unsafe for decades (or longer). Same issue with cluster munitions and high intensity bombing.

Hopefully they are treating these as a quickly deployable defense of last resort and not deploying them in advance. Mines can be deployed by special artillery shells and drones, but generally they shouldn’t be, ever.

No point in deploying them in advance. Finland has proper winters and with the freezing/thawing cycle, the mines would end up god knows where. I myself once discovered an unexploded WWII aerial bomb that popped up out of nowhere one spring on a field that was in constant farming use.

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