United States - President Barack Obama, PD* United States Air Force.
France - President François Hollande, CC* available via Wikimedia.
Germany - Chancellor Angela Merkel, Ricardo Stuckert/PR from Agência Brasil, a public Brazilian news agency, via Wikimedia.
Italy - Prime Minister Mario Monti: CC Friends of Europe's Flickr photostream.
Japan - Prime Minister Yoshihiko Noda, PD available via Wikimedia
Russia - President Vladimir Putin, CC from the World Economic Forum's Flickr Photostream.
Canada - Prime MinisterStephen Harper, CCWorld Economic Forum taken by Remy Steinegger and available via Wikimedia.
CC = Creative Commons licensed photo
PD = A photo in the public domain