Boris Johnson has declared Russia “must fail and be seen to fail” if it invades Ukraine, warning of a bloody and protracted conflict once Russian troops cross the border ..He said: “If dialogue fails and if Russia chooses to use violence against an innocent and peaceful population in Ukraine, and to disregard the norms of civilised behaviour between states, and to disregard the Charter of the United Nations, then we at this conference should be in no doubt that it is in our collective interest that Russia should ultimately fail and be seen to fail.” He added: “I believe that...