World leaders had hoped to secure U.S. backing for tougher sanctions on Russia, which struck Ukraine with missiles and drones overnight.

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.

No 10 says G7 allies back the measures - but Donald Trump indicates the US will not impose more sanctions now.

U.S. president shrugs off EU and U.K. call for more action over Ukraine war, telling Europe: “Let’s see them do it first.”

As G7 leaders converge on Kananaskis in the Canadian Rockies this weekend, the prospect of decisively tougher sanctions on Russia will loom large.