It took about 48 hours after the G20 meeting in Washington last November for the first holes to be punched in the anti-protectionism pledge to which all heads of government signed up.
Russia made the initial incision by raising car tariffs, after which pretty much everyone piled in to the breach.
This time the foolishness preceded the summit. Late on a Friday night the week before last, the Obama administration tried (but failed) quietly to slip out its decision to block imports of Chinese tyres.
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