UKRAINE

With experts linking a cyberattack in Ukraine to a hacker group in Russia, questions over the Kremlin's involvement remain.

The infiltration adds to the more than 1,300 airspace violations that happened last year around the Greek islands in the Aegean Sea.

The families of 154 Chinese passengers on board Flight MH370, which disappeared on March 8, 2014, said they believed the "missing may still be alive."

Security experts have determined the recent electricity blackout in Ukraine was a cyberattack, raising questions about how world governments should respond.

Spain and Belgium are taking over the North Atlantic Treaty Organization’s policing this week and will likely see more Russian aircraft interceptions.

Christmas is just beginning in many parts of the world with celebrations Jan. 7.

Maps designed as part of a holiday campaign either included or excluded disputed territories, such as Crimea and the Kuril Islands.

The country has launched an investigation into what prompted the Dec. 23 outage, which left tens of thousands without power.

With over 9,000 dead, Ukraine is again calling for the United Nations to send a peacekeeping force to the Donbass region.

A cyberattack from Turkey hit Russia’s communications minister as experts say the Turkish economy stands to lose $10 billion as sanctions continue.

A U.K.-based group called Bellingcat said that it has identified the Russian soldiers allegedly involved in the downing of Malaysia Airlines Flight MH17 over Ukraine.

The Japanese leader has been trying to improve relations with Moscow, but the latter's involvement in several international crises has caused delays.

After Russia banned food from Ukraine, Kiev responded to Moscow with a similar measure of its own.

Attacks, rather than technical difficulties or weather problems, were responsible for more aviation deaths than any other factor in 2015.

A new national-security assessment is a sign of how relations between Russia and the West have worsened in recent years.

The Russian finance ministry said Thursday that Kiev failed to pay off its debt before a Dec. 31 deadline.

On the last day of 2015, the Kremlin listed former Soviet republics and extremist groups as posing possible security concerns in the new year.

Kremlin officials have not responded to Ukraine's allegations that Russian hackers knocked out electricity in the country.

2015 has been a year when security concerns have dominated in many parts of the world.

The leaders of Ukraine, Russia, France and Germany agreed to extend a peace deal into 2016 in the hopes of ending the conflict in Eastern Ukraine.

The country's security service has detected malicious software on networks used by utilities, and Russian involvement is suspected.