He is ready to kill up to 200,000 people
Amidst another wave of opposition demonstrations in Iran, the Guardian reports the following regarding what Iranian supreme leader Ali Khameini is willing to do to hold onto power.
"Mohammad Khatami [Iran's reformist former president] was asked during a visit to Washington last year why he hadn't done more to resist Khamenei," he said. "He replied that it was because Khamenei is determined to fight his enemies if they come to the streets and that he is ready to kill up to 200,000 people. There are many pieces of evidence that confirm Khatami's understanding that Khamenei is prepared to kill more people.
We’ve written about Iran’s nuclear ambitions in previous posts. If Khamenei is willing to kill this many of his own citizens for their pursuit of human rights, it’s reasonable to suggest he would be much less reserved when it comes to killing non-Iranians he also judged to be his enemies.

Comments
Actually, I have to beg to differ. I dont think Khamenei would discriminate between anIranian or a non-Iranian life, however he knows killing non-Iranians would be more costly as they have their own government to protect them. In any case, Khamenei does not have any regards for human rights or human lives.