This is an article by The Sunday Telegraph, saying:
America is secretly funding militant ethnic separatist groups in Iran in an attempt to pile pressure on the Islamic regime to give up its nuclear programme.
Funding for their separatist causes comes directly from the CIA’s classified budget but is now “no great secret”, according to one former high-ranking CIA official in Washington who spoke anonymously to The Sunday Telegraph.
If this is true, it’s hard to say Iran is not justified to meddle in Iraq even if it does. The U.S. is just pushing it to the very maximum to damage Iranians.