"Slovakian carriers have reportedly started panic-buying AdBlue after Duslo, the largest AdBlue factory in Europe, announced a suspension of production due to high gas prices. German supplier SKW Piesteritz has also reduced its production, as has Yara's plant in Italy."
https://trans.info/en/european-adblue-factories-suspend-production-significant-price-increases-expected-259378
AdBlue is a compulsory additive for a large proportion of the heavy-duty vehicles complying with European standards. Without it, engines refuse to start!