Mossack Fonseca’s office in Panana. The firm has branches in Hong Kong, Miami, Zurich and more than 35 other places around the globe . The firm is one of the world’s top creators of shell companies, corporate structures that can be used to hide ownership of assets.

A massive leak of documents exposes the offshore holdings of 12 current and former world leaders and reveals how associates of Russian President Vlad(...)

Russian President Vladimir Putin speaks during his annual end-of-year news conference in December: File photograph: Maxim Zmeyev/Reuters

Vladimir Putin and Sergey Roldugin forged a bond as young men. Fast friends, almost like brothers, they cruised the streets of Leningrad, singing and(...)

A house  damaged during clashes between Armenian and Azeri forces in the   Nagorno-Karabakh region, which is controlled by separatist Armenians, in a still image taken from video footage. Photograph: Nagorno-Karabakh Military Handout/Reuters TV

A new wave of fighting broke out in the Nagorno-Karabakh region on Saturday, killing dozens and drawing international calls for an immediate ceasefire(...)

Russian  president Vladimir Putin broadcasts a speech to Moscow’s Red Square during Friday’s  festive concert marking the second anniversary of the annexation of Ukraine’s Crimea region. Photograph: Reuters/Maxim Shemetov

The European Union has urged more states to impose sanctions on Russia for seizing Crimea from Ukraine, as Russian president Vladimir Putin visited th(...)

 Gyulchehra Bobokulova behind bars during a court hearing at the Presnensky district court in Moscow on Wednesday. Photograph: Maxim Shipenkov/EPA

A nanny accused of decapitating a four-year-old girl and brandishing her head outside a Moscow subway station has been formally charged with murder. (...)

 Syrian refugees   at the closed  border gate   in Kilis, Turkey:  Local councils in Aleppo  estimate that  100,000-150,000 civilians could flee the city if Russian air strikes continue. Photograph:  Chris McGrath/Getty

Hundreds of thousands of civilians could be cut off from food if Syrian government forces encircle rebel-held parts of Aleppo, the United Nations said(...)

British home secretary Theresa May: she  announced a freeze on the UK assets of Andrei Kovtun and Dmitry Lugovoy, who is now a Russian member of parliament, after a judge said there was “no doubt” they poisoned Alexander Litvinenko in London in 2006. Photograph: PA Wire

David Cameron has promised tougher action against Russia after a public inquiry found that President Vladimir Putin probably ordered the murder of fo(...)

Ukrainian prime minister Arseniy Yatsenyuk: “The government of Ukraine is imposing a moratorium on payment of the so-called Russian bond.” Photograph:  Sergei Chuzavkov/AP Photo

Ukraine and Russia are on a collision course over major trade and finance disputes, as the European Union prepares to extend sanctions against Moscow(...)

Russian officials visiting the crash site of a A321 Russian plane in  Egypt’s Sinai peninsula. Russian airline Kogalymavia’s flight 9268 crashed on October 31st, killing all 224 people on board, the vast majority of them Russian tourists. Photograph: Maxim Grigoryev/AFP/Getty Images

A preliminary investigation into the crash of a Russian passenger plane has found no indication yet of any “illegal or terrorist act”, Egypt’s chief i(...)

Photos of Lt Col Oleg Peshkov (left) and Marine Alexander Pozynich are placed at a monument outside Russian Army General Staff headquarters in Moscow. Photograph: Ivan Sekretarev/AP

Russia has threatened economic retaliation against Turkey and said it was still awaiting a reasonable explanation for the shooting down of it(...)