Another attempt to broker peace in Syria began in Geneva this week. The Syrian regime and opposition forces agreed four main de-escalation zones in the north. Despite this ‘”truce”, though, there hasn’t been an end to the fighting and killing. There were reportedly more than 200 civilian casualties during last week’s ceasefire alone – half of them children. But across the wider region it’s Iran’s involvement in Syria’s internal conflicts that is now on Mr Trump’s radar. Iran backs the regime of Syria’s President Assad, Hezbollah in Lebanon, the Shia majority in Iraq and the Houti rebels in Yemen. That has increased the historic tensions between Iran and the Gulf Sunni regimes led by the Saudis