Waltz out of the fray

The US, Iran, China, South Korea, and the UK.

An unpleasant guest, unknown artist, National Police Gazette, 31 March 1883, University of Pennsylvania Library, Philadelphia.

The five things you need to know today:

• UNITED STATES. Trump’s national security adviser takes the bullet.

• IRAN. Washington makes new threats on the eve of talks.

• CHINA. A moderating tone doesn't a deal make.

• SOUTH KOREA. The preside…