How can Europe stop Donald Trump from snatching Greenland away from Denmark? In this surreal tussle the commander of the world’s most powerful armed forces has an advantage. We set out Europe’s three options for defending against the Trumpian threat.

We also examine the implications of the unrest in Iran. They are vast but uncertain. The possibilities range from more bloodshed and chaos in a country that has the potential to build a nuclear weapon, to Iran’s break-up to something much more hopeful. We ask how the challenge to Iran’s regime could play out, and whether American intervention could do more good than harm.

Iran is also the subject of today’s Insider programme, on which our senior editors and experts will discuss what they’re hearing from their sources in the country and what could happen next. It begins at 6pm London time.