The first in a new series of weekly briefings covering political and security risk updates from around the world. This week: the US Senate has voted down four separate gun control measures in the aftermath of the mass shooting in Orlando, Florida, which killed 49 people; the United Kingdom will shortly vote on its membership of the European Union against the backdrop of an increasingly antagonistic campaign and the shocking far-right murder of a pro-EU MP; Russia has announced it plans to maintain its military presence in the Artic region; and more from Africa, the Americas, Asia-Pacific, Europe, the Middle East and Polar regions.