By Andrew MacAskill LONDON (Reuters) – Britain said it would provide a further 1.3 billion pounds ($1.60 billion) in military support and aid to Ukraine, making the pledge ahead of a planned video call on Sunday by Group of Seven leaders with Ukrainian President Volodymyr Zelenskiy. Prime Minister Johnson has been one of the strongest supporters of Ukraine’s efforts to resist Russian forces since Russian President Vladimir Putin launched the invasion on Feb. 24. Johnson’s government has sent anti-tank missiles, air defence systems and other weapons to Ukraine. The new pledge almost doubles Bri…