They're paranoid about Russia sending out thousands of sleeper cells in the chaos.
No they're not. Finland would be the more obvious target and Finland clearly isn't worried at all. Russia neither has "thousands of sleeper cells" available nor would they deploy them in such an unproductive manner - coming in as openly Russian, in a manner where you can't avoid attention, and have access to literally nothing important would be a waste of time. Either Russia already has thousands of sleepers in those countries or they don't have capacity at all.
Poland is run by a right-wing nationalist and openly xenophobic government that has one of the biggest reps for hating refugees in all of Europe. Whether you're Black or Muslim or Ukrainian, you already know about Polish institutional racism. So don't try and make this something that it's not just because the thread has decide to treat it like a spectator sport rather than a war.
No, as a matter of fact we don't. We want Russians to get fed up with their current regime and collectively decide to remove them. That option is better for them as well as the international community in the long run. That's the first significant step in lifting the international sanctions that are strangling them economically.
The next step would be a leadership whose buddy list is a little more diverse than the axis of super villains.
And they're going to do that while stuck behind an information firewall in a place where dissent is immediately crushed? With no movement to get behind and no opposition leader with a prayer to follow? The average Russian can do literally nothing to accomplish that other than opt out of the system and tell their friends to do so as well, and they're going to be a lot more successful at that from outside the country than from within it.
Plus, forcing people to stay in a human rights disaster so that you can coerce them to accomplish your political agenda is usually considered a human rights violation - that's why the UN charter on refugees is focused on accepting them rather than on forcing them to "change their country".
It's crazy that this thread on one hand has post after post laughing at how fukking horrible it is to be a Russian soldier right now, yet simultaneously wishes to force innocent people to do it and likely die in the process because internet memes.