The World Trade Organization (WTO) on Wednesday handed a fresh victory to China, permitting it to slap duties on $645 million worth of US imports per year, in a long-running anti-dumping dispute with Washington. The United States, which is unable to appeal against the decision, branded it “deeply disappointing” and said it reinforced the need to reform the WTO’s rules, saying they were being used to “shield” China. “In light of the parties’ arguments and evidence in these proceedings, we have determined that the appropriate level… is $645.12 million per annum,” a WTO arbitrator ruled. The WT…