What criteria are you using?
Cutting food production in half would not jeopardize food security. Switching focus to plant-based food production would more than double it again.
In all earnesty, what does it change to send troops to Ukraine? What did any of these red lines we European were afraid of help?
Should not send tanks, it could start a war.
Should not send planes, it could start a war.
Should not allow Ukraine to attack inside Russia, it could start a war.
Let's hope butter and bacon from Poland is going to cover our needs.
We can reduce land use and have food security if people were not so intend on eating/drinking animal products every day (and there are perfectly fine vegetarian alternatives).
A huge chunk of that output is purely for export.
Pole here - Poland switched form being a pork exporter to an importer over the course of the last few decades.
Top external suppliers are...
Denmark (53kt)
Belgium (50kt)
Germany (44kt)
The Netherlands (24.5kt)
Spain (24.5kt)
That's really hilarious: Poland imports it's pork from Denmark.
(ASF and almost no piglets breeding)
It's not like this will happen overnight anyways.
Sure, but Europe's not growing. It is purely in "shrink forever" mode. This is easily measured, any time fertility drops below 2.1 that's what happens. But ignore that a moment, what if you wanted to depopulate Europe? This might be a good policy for that. Get the timing just right, and it's not even a genocide... food shortages that don't starve anyone just encourages the last few breeders to put a lid on it, and voila! The fantasy of more than a few out there.
Increased lifespans will soon come to an end, but even if magically they could remain you'd just end up on a planet where everyone's too old to have children anymore, and human extinction is locked in. Every second fertility rate's below 2.1, there are fewer people of reproductive age and within your own lifetime there won't even be enough of those to sustain a world population in the tens of millions if suddenly they switched back to 2.1 (and they won't). This is doomsday. But be sure to have fewer children to reduce your carbon footprint.