Iranian Foreign Minister Mohammad Javad Zarif said one option "would involve resuming at a much greater speed our nuclear activities."
The four countries singled out in the latest State Department report on human rights are the same targeted by U.S. foreign policy.
Ahead of a possible meeting with Donald Trump, North Korean supreme leader Kim Jong Un said he no longer needs to test nuclear weapons and ballistic missiles.
China is investing in military bases to project its power across the Asia Pacific and there's little the U.S. can do to stop it.
Hossein Salami, second-in-command of the Revolutionary Guards, told Israel, “There is no way for you but the sea.”
The U.S. gained an ally in Baghdad after overthrowing Saddam Hussein in 2003, but an alliance of Iran, Iraq, Russia and Syria is growing stronger.
"There has been nobody tougher on Russia than President Donald Trump," said President Donald Trump.
Iran is sending officials to Lebanon, Iraq and Syria as tensions mount with Israel, Saudi Arabia and the U.S.
Chinese President Xi Jinping appears to be losing patience with Taiwan's ideas of independence and he's turning up the heat with military exercises.
President Donald Trump challenged Vladimir Putin in Friday's Syria airstrikes, but the Republican leader is averse to new sanctions.
Naples Mayor Luigi de Magistris said his "City of Peace" was no place for nuclear weapons or nuclear-powered vessels.
Iraq was one of the few Middle Eastern countries to condemn the U.S. attack on Syria, which Baghdad saw as an ally against ISIS.
A 2008 test showed that a 52-foot-high tsunami could strike the Fukushima nuclear plant, but bosses delayed building a protective seawall.
Since 2001, the U.S. has been involved in several ongoing overseas conflicts with no clear end in sight.
The world's top two military powers may be on a collision course in Syria.
"The Russians met their match," said CIA Director Mike Pompeo, who has been nominated for secretary of state.
Iranian supreme leader Ayatollah Ali Khamenei says it's the Islamic Republic's duty to protect citizens from social media companies stealing their data.
"We hope the Trump administration thinks twice before deciding to attack Syria," the ruling Chinese Communist Party's newspaper said.
Defense Secretary James Mattis is heading to the White House to show President Donald Trump his options for attacking Syria.
Russia has bolstered its air defenses in Syria, but shooting down a U.S. cruise missile is a sophisticated task that will put Putin's military to the test.
Two opposing, multinational alliances are forming as President Donald Trump decides whether or not to attack Syria.
Pope Francis warned "the unguarded tongue, set on fire by hell, sets all things ablaze" in an attack on fake Internet news.
Russian jets are soaring over the waters of the Mediterranean, and Syria has moved new air defenses near Assad's presidential palace.
Fifteen years after the fall of Baghdad, Iraq has reportedly killed one of ISIS chief Abu Bakr al-Baghdadi's top men.
As a trade war looms, China says it won't tolerate U.S. arms sales to self-ruled Taiwan.
President Trump could decide whether to attack Syria as soon as "later today," a move that could draw a Russian military response.
The battlefield may never be the same again after humans followed remote-controlled military vehicles into battle.