” Why would anyone believe that? They are having enough trouble with Ukraine.”
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Exactly. Its garbage news.
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There are various possibilities. It’s probably just fodder for domestic propaganda, to raise morale and support for the war and bolster national pride.
It also could be trolling. Trolling Europe and NATO. Maybe trolling Poland to see if they will overreact somehow.
I’ve said before, it makes no strategic sense to keep trolling Poland if you have future plans to invade. You’re just giving them a chance to prepare their military and defensive capabilities.
The third possibility, similar to the trolling scenario, is that they want an escalation. Not with Poland, but with NATO and Ukraine. They may feel that being bogged in a mostly conventional war isn’t working and an escalation would give them more tools. They will need an excuse though, so they can claim they didn’t escalate. So they will troll for an over-reaction and perhaps even plan false-flag ops.
Unlike the rest of Europe, Poland has been spending 5% of its gross national product on defense, re-arming (largely with state of the art weapons systems obtained from S. Korea), and doubling the size of its army. It takes the threat posed by Russia very seriously.
In a purely conventional war, Poland could handle Russia, at least for a time.