Cameron: Europe must take pain to stay united on Russia sanctions

U.S. President Barack Obama toasts with beer as he visits Kruen, Germany June 7, 2015. REUTERS/Daniel Karmann/Pool

KRUEN, Germany (Reuters) - British Prime Minister David Cameron said Europe had to stay united to keep sanctions on Russia in place despite any pain they caused the 28-nation bloc, urging the Group of Seven industrial nations to send Moscow a tough message on Ukraine.

Cameron was speaking after U.S. President Barack Obama said the meeting of the G7 in the Bavarian Alps would discuss standing up to Russian aggression in Ukraine, amid an upsurge in violence there that monitors have blamed on Moscow-backed separatists.