A number of Russian scientists have been arrested and charged with treason in recent years for allegedly handing sensitive material to foreigners.
The coronavirus disease has infected almost 2.2 million people and killed nearly 150,000 globally since it first emerged in China's Wuhan. Here are the latest updates for April 17:
The warnings of planted bombs, all of them false, have been sent to numerous Russian cities, but particularly targeted the capital, where around 16 million live and work, with up to 1,000 threats per day.
Prominent Russian opposition leader Alexei Navalny has been transferred from hospital back to jail to carry out the rest of his 30-day sentence while his own doctor fears he may have been poisoned.
Israel's military confirmed it attacked Iranian military targets in Syria, hours after carrying out a rare daylight air raid near the Damascus International Airport.
Mikhail Popkov was found guilty of killing 22 women in 2015. He later confessed to 59 further murders but was convicted only of 56 because the investigators had not managed to prove three of the crimes took place, Interfax news agency.
Treasury Secretary Steven Mnuchin says the nine firms and people being added to the US blacklist are "critical actors" in a scheme to support Syrian regime leader Bashar al Assad. Officials in Moscow dismiss the sanctions as illegal.
US astronaut Nick Hague and Russian cosmonaut Alexei Ovchinin were heading to the International Space Station when they had to make an emergency landing due to failure of the booster rockets.
The Syrian Observatory for Human Rights said regime and Russian air strikes killed 64 people in eastern Ghouta's Kafr Batna district and another 12 in the Saqba district. The Syrian Civil Defense group reported 61 fatalities in Kafr Batna.
Recent drone attacks and mortar and rocket shelling in recent days have raised doubts about the sustainability of the Assad government's recent victories.
Kremlin will take action against Google if articles from Sputnik and Russia Today are placed lower in search results, says Russia's chief media regulator.
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