A branch of the US Treasury uses sophisticated financial tools to hit targets linked to hostile governments. This is the new global warzone, write Leah McGrath Goodman and Lynnley Browning.

China’s top two state oil firms have agreed to lift about 140,000 barrels of crude oil per day from Libya under term deals for 2012, set to raise China’s crude purchases from the North African exporter after supply disruptions last year.