I know of the famous Percentages Agreement between Stalin and Churchill. As is commonly known, Stalin reneged on his promise in regards to Hungary, Bulgaria and Romania which eliminated all British influence by 1950, but at the same time kept his promise on Greece and Yugoslavia.
My question is, was Stalin intending to renege his promise on Greece and Turkey as well, but was thwarted? Was there a Soviet conspiracy to start/further support communist insurgencies in these countries, or did Stalin keep his sphere of influence?