Iran over its nuclear program have come and gone for years. In recent weeks such talk has intensified, though it's still anybody's guess as to whether Israel or the United States might openly carry out military action any time soon. But most experts agree on one thing: A covert war with Iran has already been raging for years. Details are often murky, but the conflict has been punctuated with brazen assassinations, exploding missile sites, crippling cyberattacks, and a litany of arrests and spying allegations on all sides. Below is a timeline of major developments in the war—or at least the ones that are publicly known.