Donald Trump, the US president, is preparing “shock and awe” sanctions on Russian exports, a senior Republican has said. Senator Jim Risch, the chairman of the powerful Senate foreign relations committee, said Mr Trump would make good on his pledge to impose crippling economic penalties on Moscow’s trading partners by Aug 8. The US president this week shortened his deadline for hitting Russia with the most severe sanctions on its oil experts to date, giving Vladimir Putin 10 days to reach a deal to end the war in Ukraine. “When and if secondary sanctions hit, it’s going to be shock...