The idea of an oil embargo against Russia is unrealistic. ...
Russia maintains a "list ... of countries that are considered 'unfriendly'/'hostile' towards Russia." This is reported by the Russian news agency Tass. In addition to Switzerland, the list includes, among others, the countries of the European Union, Australia, Great Britain, Canada, South Korea, Japan, and the USA."
For fertilizers, Russia has already imposed (until the end of March, temporarily) an export ban.
Therefore, it would also be an option to consider that Russia, in turn, might no longer supply "unfriendly countries" with selected raw materials?