They used to taste it in the past.
The term sweet originates from the fact that a low level of sulfur provides the oil with a relatively sweet taste and pleasant smell, compared to sulfurous oil. Nineteenth-century prospectors would taste and smell small quantities of oil to determine its quality.[4]
After USSR they realized they have no chance militarily, so all their work is concentrated on disinformation, sabotage and subversion.
Military was only meant to be used specifically to seal the deal once the main work was done.
https://en.wikipedia.org/wiki/Foundations_of_Geopolitics