According to whistleblower and founder of the independent news website NewsBud, Sibel Edmonds, the Western intelligence has given a secret ultimatum to a faction of the Iranian army in order to proceed in a coup to topple the Iranian government.
Citing well-informed sources from the region, Edmonds describes the blackmail, which basically consists of two possible plans.
About a year ago, the Western nations had secret meetings with some Iranian high-level military officials outside Iran. The Western intelligence military provided the following ultimatum to the Iranians:
Plan A: you topple the government with a military coup and make it look like you are anti-American, anti-Western, based on your nationalism. You will make it look like it is for the sake of the Iranian people who are suffering from the economic depression. Behind the scenes we will support you and we will lift the sanctions.
Plan B: the Western nations are going to topple the Iranian government and it's going to be much worse than Syria scenario. Close to 3 - 3.5 million casualties are going to result in Iran. Also, the majority of the armed forces of Iran will be wiped out. The Western officials have even revealed the whole operation to the Iranians. That is, how many weeks the invasion will take place, the airstrikes, etc.
So, basically, the Western neocolonialists said to the Iranian officials 'take it or leave it'. Either you proceed in plan A by yourselves, or, we are going to do it through plan B, which, of course, is much worse.
Edmonds claims that even the Russians and Assad agreed with plan A because they see that plan B could be disastrous for their interests in the region.