The phrase "severe sanctions" refers to strong punishments or penalties imposed on someone or something for their actions. It is a way to discipline or deter them from continuing their behavior. Full definition
I added that if we continued to fall short of the targets, we could face more severe sanctions — up to and including state takeover. (ascd.org)
He warned troops to hold on firmly to all equipment issued as the loss of any equipment will attract severe sanctions. (securitykingng.org)
Several top D.E.A. staffers were recommending that the agency impose severe sanctions against the drug maker, including possible restrictions on how much OxyContin it could make. (nytimes.com)