The United States and Iran are set to start a new round of talks in Switzerland on Sunday in a bid to finalise the Memorandum of Understanding signed last week. The teams have a timeframe of 60 days to resolve some of the more difficult issues such as what will happen to Iran's nuclear program and stockpiles of uranium. However the talks have already been shrouded in uncertainty as Israel and Hezbollah - not parties to the agreement - have continued to clash in Lebanon, with Tel Aviv refusing to withdraw from the territory.