By John Irish, Jarrett Renshaw and Andreas Rinke KANANASKIS, Alberta (Reuters) -Group of Seven leaders faced early challenges during meetings in Canada on Monday as U.S. President Donald Trump said removing Russia from the former Group of Eight over a decade ago had been a mistake.

Leaders of the world’s largest economies and democracies proceeded with their agenda at the 50th Group of Seven summit in Canada, despite President Donald Trump’s early exit. But regardless of efforts to present a united,