The US has imposed sanctions on Serbia's main oil supplier, NIS, which is majority-owned by Russia. The sanctions, effective immediately, will disrupt fuel supplies and payment methods at petrol stations. Serbian President Aleksandar Vučić is reluctant to nationalize the company, which employs 5,000 people and significantly contributes to the Serbian economy. The sanctions are expected to have severe consequences, including potential layoffs and fuel shortages, while the Serbian government reassures the public about current fuel stock levels.