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President Trump publicly called on Ukraine and China to investigate the former Vice President Joe Biden and his son last week.
There are about 13,885 nuclear weapons in the world. Here's an overview of the world's nuclear states and their arsenal.
A landing craft carrying researchers ashore from a Russian navy tugboat was attacked and apparently sunk by walruses during an Arctic expedition.
Four major foreign-policy goals should drive Trump's selection of his next national security adviser, writes Defense Priorities fellow Gil Barndollar.
The Botuobinskaya diamond mine is located in Yakutia, a region in Siberia that's five times the size of France and has only a million inhabitants.
President Donald Trump reportedly derailed a meeting with world leaders at the G7 on Saturday evening after he insisted on Russia's readmittance.
Because Russia has prioritized the deployment of some programs despite their technical challenges, the US will be forced to upgrade its defenses.
Russia's account of a deadly explosion that rocked a missile test site last week has been changing. It looks to be part of testing a new missile.
Russia gave posthumous awards to five nuclear experts and "national heroes" who died in a mysterious explosion at sea during a rocket engine test.
A new study traces "an unprecedented release" of radiation in 2017 to the Mayak nuclear facility in Russia.
Both NATO and the Nordic governments have been concerned by Russia's development of new nuclear-ready missiles.
The Russian military expressed their "deep regret" over the fracas, South Korean officials reportedly said.
A top Russian official says Moscow is ready to sell Su-35 fighter jets to Turkey after the US excluded Turkey from its F-35 fighter jet program.
More than 12 million new users downloaded FaceApp in the past week, but now people are concerned that the Russian app could be misusing their photos.
FaceApp's Russia-based development team addressed concerns and criticism over how the popular app handles user data and privacy.
Russia has released video footage of a Russian fighter intercepting a US bomber near its border. The video was shot from inside the fighter's cockpit.
Only a few months after the US accused Russia of violating an arms control treaty, the US is now accusing Russia of conducting secret nuclear tests.
The Justice Department charged WikiLeaks founder Julian Assange with 17 counts, including violating the Espionage Act.
US fighter jets and tankers are in Sweden to practice taking on enemy air defenses in one of the world's most inhospitable regions.
The president's son was subpoenaed by the Republican-controlled Senate Intelligence Committee last week.