Iran is governed by a brutal regime which has been openly hostile to the West.
Donald Trump has yet again radically and recklessly escalated tensions in an area where peace-keeping was already on a knife-edge.
There is a real danger this will stoke further conflict, undermining peace and stability in the region. Given the severity of the crisis, the Prime Minister must make a statement about the UK's position immediately.
The UK should not automatically follow whatever position the Trump administration takes, but work with a broader group of concerned states at the United Nations.