Greg Myre

U.S. presidents have a tradition of entering office and expressing hope for improved relations with Russia. This is matched by a tradition of presidents leaving office amid friction with Moscow.

The U.S. has now bombed both main players in the Syrian war: President Bashar Assad's military and the Islamic State. But the Trump administration hasn't spelled out what sort of outcome it's seeking.

During a joint press conference at the White House with King Abdullah of Jordan on Wednesday, President Trump refrained from using the term "radical Islamic terrorism" to describe ISIS.

The U.S. was a reluctant entrant into World War I. But when America joined the battle 100 years ago, on April 6, 1917, it transformed a small military in a major international force almost overnight.

The war is remembered for trench warfare, millions of deaths and the failure to bring lasting peace. But it also brought together emerging technologies, remaking life on and off the battlefield.

Authorities are learning more about the man who attacked Westminster Bridge and the Houses of Parliament in London this week. The attack corresponds closely with instructions provided by ISIS' propaganda magazine, which details which kinds of vehicles to use and even which kinds of knives to use — and not use — in these types of terror attacks.

An attacker killed three people and injured dozens in London Wednesday. The nature of the attack is similar to previous such ones in the U.S., Europe and the Middle East.

The United Kingdom has joined the U.S. in restricting large electronics from being carried on flights that depart airports in certain Middle Eastern and North African countries. Security officials won't explain precisely why they have ordered the restrictions, but it's thought there could be dangers associated with laptops or other such devices being used as weapons.

Passengers on flights from the region coming into the U.S. and Britain cannot carry any devices larger than a smartphone. Laptops, tablets and cameras must all be placed in checked baggage.

The Justice Department is charging Russia's intelligence service with helping compromise half a billion Yahoo email accounts in an attempt to steal secrets from dissidents, journalists and others.

WikiLeaks on Tuesday disclosed the hacking tools from the so-called Vault 7 series. Now Assange says his group will be working with big manufacturers to develop fixes.

The alleged CIA documents reveal a hacking program that is very different from the one uncovered by Edward Snowden's NSA leak. One distinction: Mass surveillance vs. targeted attacks.

WikiLeaks has released a huge trove of documents that reveal information about the CIA's cyber-espionage capabilities. Its hacking tools let it compromise computers, mobile phones and even TVs to use as spying devices.

President Trump has withdrawn his executive order restricting travel to the United States and issued a new one with a narrower focus. Counterterrorism analysts wonder what the administration plans to do about a much likelier terror threat than refugees — Americans who could become radical and attack at home.

The U.S. military has been waging periodic drone strikes against al-Qaida in Yemen for years. A series of airstrikes and a ground raid have intensified the campaign over the past month.

The Obama administration began checking social media accounts of prospective Syrian refugees more than a year ago. Such steps could expand as President Trump prepares a new executive order on vetting.

McMaster first made his name as a captain in Iraq in 1991. Then, in 2007 he was a key figure in the "surge." Now, 26 years after he first went to Iraq, he'll be seeking a solution in his new post.

Iran and North Korea have fired off missiles. A Russian spy ship floats off the U.S. coast. To date, President Trump's reaction has been very much from the traditional foreign policy playbook.

Leaking classified information is a crime, but it's also one of the most popular sports in Washington. Candidate Trump encouraged leaks. President Trump calls them a crime.

Russia is at the center of recurring controversies swirling around the president. Yet he has consistently taken a softer line on Russia and hasn't spelled out his plans on a range of critical issues.