By David Ljunggren, John Irish and Jarrett Renshaw KANANASKIS, Alberta (Reuters) -Group of Seven leaders met on Monday seeking a common approach on wars in Ukraine and the Middle East but before their summit formally began,

Donald Trump said it was a “big mistake” to exclude Russia from G7 summits as he used his opening remarks of the meeting in Canada’s Rocky Mountains to lament the group’s treatment of Moscow.

Six of the Group of Seven leaders are trying on the final day of their Tuesday to show the wealthy nations’ club still has the clout to shape world events despite the early departure of President Trump.