At the heart of that doctrine is Obama's determination to act through alliances of the unwilling, or at least extremely reluctant.

BBC: North Korea: A test for the Obama doctrine

Hillary Clinton's determination to act as a virtual co-president back in 1993 helped to create a backlash against her husband's administration.

ECONOMIST: Let Michelle be Michelle

His talent to amuse had been noticed in Lichfield, and when he arrived in London his determination to act was driven only partly by the failure of the wine merchant's business he ran.

ECONOMIST: Theatre history