The group is 7 not 8 now as Russia has taken itself out of the game by deciding to enter both the Crimea and eastern Ukraine. Russia was clearly a key part of discussions, primarily in respect of its incursions, but there were also the continued problems of the Greek economy to be hammered out. In addition there were clear commitments on climate change.
The BBC report of events is here: http://www.bbc.co.uk/news/world-33064391
The PM will be reporting back to the commons.