Obama says G7 must stand up to Russian 'aggression' in Ukraine
US President Barack Obama

US President Barack Obama urged fellow leaders of the G7 to stand up to "Russian aggression in Ukraine" as he enjoyed a traditional Bavarian welcome ahead of their summit in Germany.

One of the issues G7 leaders would be discussing over their two-day summit was "standing up to Russian aggression," Obama said in opening remarks as he was welcomed by German Chancellor Angela Merkel.