And that can be sustained in international crisis: farming that is a house of cards highly dependent on international supply chains of fertilizer, feedstock and fuel won't help you all that much under blockade.
No-one mentions this when food security is discussed. The farmers here in NL use the security excuse too but absolutely no-one mentions that their food production is directly dependant upon the import of magnitudes higher tonnage of feedstock - soya from Brazil - than the meat / dairy it produces. Then I'm not even looking at the fertilizers / chemicals which are also imported.