There’s a few articles which examine whether states should invade other states for humanitarian reasons. This one by David Bosco compared Obama’s response to the Arab Spring to the BUsh White House.
John Kampfner’s book on Blair’s Wars came out shortly after things began to go very seriously wrong with the 2003 invasion of Iraq. This gives it an interesting perspective, and Kampfner sets out the successes and achievements that, as Blair himself says, often get forgotten when assessing his premiership.
These are the slides we used in the class: lib interventionism