PARIS—A French cabinet minister urged EU countries on Friday not to use the Russian or Chinese COVID-19 vaccines unless they are approved by the bloc’s medicines regulator, warning of a risk to the bloc’s unity and public health. After a fitful start to the European Union’s vaccination campaign which has left the bloc lagging other countries such as Britain, some member states in central Europe have already bought or are considering buying Russian or Chinese shots. Asked whether each EU member state was now simply doing “what they wish themselves,” European Affairs Minister Clement Beaune told RTL radio: “If they were to choose the Chinese and/or Russian vaccine, I think it would be quite serious.” “It would pose a problem in terms of our solidarity, and it would pose a health risk problem, because the Russian vaccine is not yet authorized in Europe,” he said. The EU has so far …