Holy heck. For the country the size of Poland they aren't messing around. I suspect they are the ones that realize that the Russia/China + others threat is growing increasingly likely.
Partly given history but they don't necessarily trust/depend on other European countries to have their back if a conflict with Russia did arise and they have no delusions when it comes to the realities of Russia.
They also understand Russia might be down, but they aren't out, despite the impression a lot of people in the West seem to have, and while unlikely if Russia did decide to go "all in" they still have the capacity there to build back up to a major threat to Europe, especially if there is a situation where things with China flare up. I think people are a bit blind sided by the fact Russia will do things we kind of think of as unthinkable - a bit longer down the road but for example if it comes to it they'd have no problems with using child labour to make up shortages in the factories, etc. etc.
EDIT: Generally people still think of it in terms of peacetime norms and while changes in Russia have been really slow if the normal peacetime factors are removed things can change much quicker than people think - for example with the Gepard ammo it took 7 months from contract to production but if the stops were pulled out that could easily be a couple of weeks.
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