LONDON (Reuters) -Britain is planning to supply Ukraine with anti-aircraft missiles to help it defend its skies from Russian invasion, defence minister Ben Wallace said, stressing that the technology fell within the definition of defensive weapons. “It is vital… that Ukraine maintains its ability to fly and suppress Russian air attack,” Wallace told lawmakers. “In response to Ukrainian requests, the government has taken the decision to explore the donation of STARStreak high-velocity man-portable anti-air missiles. We believe that this system will remain within the definition of defensive we…