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.

As the Group of Seven (G7) leaders gathered for a summit in Canada on Monday focusing on conflict and trade, US President Donald Trump bemoaned the exclusion of Russia. Ahead of the official start of this year's G7 summit of leading democratic economies in Canada,