BEIRUT, June 16 (Reuters) - Lebanon has suffered the deadliest spillover of the regional war triggered by the U.S.-Israeli strikes on Iran more than three months ago, which is set to end with a deal between Washington and Tehran. The conflict spread to Lebanon on March 2, when Iran-backed group Hezbollah fired on Israel in support of Tehran, triggering an Israeli air and ground campaign. Here are some of the main costs for Lebanon.