April 10 (Reuters) - Rio Tinto Plc RIO.L is reviewing its trading relationships with Russian aluminum producer United Company Rusal 0486.HK to make sure it complies with U.S. sanctions and has had calls from customers concerned about supply, Rio's aluminum chief said on Tuesday.
Asked specifically what action Rio might take regarding Rusal's 20 percent stake in Rio's Queensland Alumina operation in Australia, Alf Barrios said it was premature to speculate. Rio owns the other 80 percent.