Russia's government officials have vaguely threatened nuclear war against multiple European countries this year alone. NATO is standing together for now, but some major political parties in key NATO members have connections to Russia.

Russia also loudly denied any plans to invade Ukraine until they rolled across the border. And they've been repeatedly caught committing barbaric atrocities against civilians in occupied territories.

So if the Poles want to sign up for military training, then more power to them. Being willing to defend your loved ones and your country is a noble endeavor. You don't even need a specific reason. And if the Poles want the ability to defend themselves without being utterly reliant on their NATO allies, that's their right.