The Kremlin says Russian President Vladimir Putin has called U.S. President Donald Trump to thank him for a Central Intelligence Agency tip that has helped thwart a series of bombings in St. Petersburg.
Russian Federation said the information was significant enough for its FSB security service to track down suspects who were planning suicide bomb attacks on Saturday on the two-century-old Kazan Cathedral and other sites.
According to Vesti, Putin asked Trump to thank CIA Director Mike Pompeo for providing the information, and he told the US president that "the Russian security services, in the case where they receive information regarding terrorist threats in relation to the USA and its citizens, will without question and immediately pass it to their American colleagues".
In a phone call on Thursday, Trump and Putin discussed the crisis over North Korea's nuclear programme, and the United States leader took the unusual step of thanking his Russian opposite number for hailing the American economy. The White House said Trump thanked Putin for remarks he made "acknowledging America's strong economic performance".
Mr Putin told Mr Trump that Russia's special services would hand over information on terror threats to their U.S. counterparts, it added.
Earlier, the Russian Federal Security Service (FSB) arrested the members of a terrorist cell linked to Islamic State (IS, formerly ISIS) in the Russian city of St. Petersburg.
Among the targets was the city's famous Kazansky Cathedral, a popular tourist site. It said a search of a St Petersburg apartment found explosives, automatic weapons and extremist literature.