[rapjr9]

If anything the situation is probably the reverse, that fertilizer/chemical shortages are causing shortages of explosives for making weapons. Building more Stinger's is currently projected to take a year or two because of difficulties in getting parts. One "part" is the high explosive, whose ingredients come from China, now being affected by lockdowns. If the West was at war with both Russia and China they would likely have to divert some fertilizer to weapons manufacture and agriculture would suffer both from the shortage of imported fertilizer and the extra demand due to weapons manufacture. Even so I'd expect the effect to be small, agriculture must use a lot more chemicals than explosives do.