The country's U.S. base closed in 2014, as tensions between Russia and the West peaked over Ukraine's decision to topple the pro-Russian government in Kiev.
Special Forces head General Raymond Thomas said that, while the U.S. may wanna stay, Syria was a sovereign state and its government backs Russia.
The U.S., Russia and China are all looking to surpass each other with military innovations such as missiles and drones that use artificial intelligence.
Amnesty International documented 101 cases of detention incommunicado and torture of suspects, who were often detained with little evidence.
The three countries all want a stake in Syria's future and appear willing to secure it by making long-term military commitments.
North Korea claims it's not scared of President Donald Trump or his "old warmonger" Secretary of Defense James Mattis.
Russian helicopters blasted their targets not far from where the U.S. and NATO allies have just begun fortifying their air defenses.
Two Syrian activist groups with ties to the country's opposition also offered opposing claims about the Islamic State militant group leader's death.
Despite being largely defeated in its former Iraqi stronghold of Mosul, the Islamic State militant group is still gaining territory amid new clashes.
The Islamic State militant group killed an activist from California, a U.S. Army veteran from New York and another YPG volunteer from the U.K.
U.S. allies and enemies have praised Iraq for defeating the Islamic State militant group in Mosul, highlighting the complex nature of battling ISIS.
The U.S., India and Japan are conducting perhaps their most complex joint naval drills yet, and leading Asian powers Pakistan and China are getting closer.
Facing near-total defeat in its former stronghold of Mosul, the Islamic State militant group has launched a new, deadly offensive in Iraq.
The U.S. and Russia have taken leading, often opposing, roles in world affairs, but recent events in Syria and North Korea may invite more cooperation.
North Korea's Kim Jong Un has said nuclear weapons are key to his government's survival and the latest missile test may prove this to be true.
Experts weigh in on whether the U.S. faces a nuclear threat after North Korea successfully tests its first intercontinental ballistic missile.
The U.S. and Russian militaries have found themselves increasingly at odds in the world.
President Donald Trump has changed course a number of times on Syria, but recent events pit him directly against Russia and Iran.
Kurdish militants are on the front lines of U.S.-led efforts to defeat the Islamic State militant group, but what happens when the battle's over?
Russia made threats to retaliate in several ways after the U.S. Navy shot down a Syrian regime aircraft Monday.
Former U.S. Ambassador to Syria Robert Ford said President Barack Obama left his successor with little option but to ultimately withdraw.
Russia severed a military hotline with the U.S. and has said it will turn its air defenses on any U.S. plane that crosses battle lines in Syria.
Around 100 U.S. troops ended a six-year mission earlier in 2017 after failing to capture Kony, whose group has co-opted tens of thousands of children into conflict.
The U.S. is finishing up naval exercises with NATO allies in the Baltic region, but Russia has an even bigger display of military might in the works.