Saint Petersburg

A Russian soldier patrols the roof of the ExpoForum Convention ahead of the St. Petersburg International Economic Forum 2016 (SPIEF) in Saint Petersburg, Russia, on Wednesday, June 15, 2016. The 20th anniversary St. Petersburg International Economic Forum which brings together heads of state and governments, political leaders, leading experts and global company executives runs from June 16-18. Photographer: Simon Dawson/Bloomberg

Simon Dawson/Bloomberg

A Russian soldier patrols the roof of the ExpoForum Convention ahead of the St. Petersburg International Economic Forum 2016 (SPIEF) in Saint Petersburg, Russia 

Workers prepare the launching ceremony o...Workers prepare the launching ceremony of the Russian diesel-electric attack submarine Stary Oskol on Admiralty Shipyard in Saint Petersburg on August 28, 2014. Submarine "Stary Oskol" Project 636 is the third in the series, built to deliver the Russian Black Sea Fleet. Stary Oskol belongs to the Improved Kilo by NATO classification.

Olga Maltseva/AFP

Workers prepare the launch of the Russian diesel-electric attack submarine Stary Oskol at Admiralty shipyard, St Petersburg

US President Barack Obama (R) meets King...US President Barack Obama (R) meets King Carl Gustaf of Sweden during a reception at the Royal Palace in Stockholm on September 5, 2013. Obama is in Sweden for a two-day visit before heading to the G20 summit in Russia's Saint Petersburg, where he is expected to rally support for or at least acceptance of moves to punish Syria's President Bashar al-Assad for an alleged deadly gas attack on a Damascus suburb last month.      AFP PHOTO / JEWEL SAMADJEWEL SAMAD/AFP/Getty Images

Jewel Samad/AFP

US President Barack Obama meets King Carl Gustaf of Sweden during a reception at the royal palace in Stockholm. Mr Obama is in Sweden for a two-day visit before heading to the G20 summit in Russia’s Saint Petersburg.