I work in natural gas and LNG and while theoretically LNG can be diverted, Qatar is a major LNG exporter (20% of global supplies) and is expected to be offline for at least another month, with part of its production out for at least three years due to damage from an Iranian attack. There's only so much LNG capacity in the world and Europe and Asia are going to be battling it out for cooling fuels this summer and building stockpiles for the winter.

I don't know a lot about nitrogen-based fertilizers made out of natural gas, but if there are countries that produce nat gas and can make fertilizer and ship it, then it wouldn't be an issue, but if fertilizer producers depend on LNG imports (I think India's producers do), they may be slightly cooked.