Foreign Secretary Yvette Cooper has said the UK is “ready to act” after Donald Trump urged Nato countries to shoot down intruding Russian planes. Ms Cooper criticised Moscow for its “provocative and reckless” violations of Nato air space in recent weeks during a speech to the United Nations. It came as Mr Trump said Ukraine can win back all territory it has lost to Russia – a dramatic shift from his previous call on Kyiv to make concessions. Ms Cooper told the United Nations Security Council meeting on Tuesday: “Ukraine’s security is our security, and all of us depend on upholding the UN Charter. In a statement, the alliance condemned the incursion by three MiG-31 jets on Friday, describing it as “part of a wider pattern of increasingly irresponsible Russian behaviour”.