* Netanyahu's security cabinet decides on the move * U.S.-sponsored peace talks were due to expire next week * Abbas seeking unity government within five weeks (Adds quotes from Kerry, paragraphs 6-10) By Jeffrey Heller JERUSALEM, April 24 (Reuters) - Israel on Thursday suspended U.S.-sponsored peace talks with the Palestinians in response to President Mahmoud Abbas's unexpected unity pact with the rival Islamist Hamas group. "The government of Israel will **t hold negotiations with a Palestinian government that is backed by Hamas, a terror organisation that calls for Israel's destruction," an official statement said after a six-hour meeting of the security cabinet.