VLADIMIR PUTIN

Over the past several months, Russian fighter jets have entered Turkish, Estonian, Latvian and Lithuanian territory during missions, provoking heavy criticism from NATO’s allied countries. 

Concerns that Turkey's shooting down a Russian warplane could lead to a world war emerged on social media.

International powers are preparing to lift sanctions against Iran following a nuclear deal worked out in July, and states across the region are working to update their defenses.

At the White House Tuesday, France and the U.S. solidified their unity in the fight against the Islamic State group and advocated de-escalation between Russia and Turkey.

Russian helicopters are still searching for the pilots.

Protesters reportedly appeared in front of the embassy in Moscow hours after Turkey shot down a Russian warplane.

Russian President Vladimir Putin called the shoot-down of a Russian jet a stab in the back, saying it was carried out by "accomplices of terrorists."

NATO's collective defense clause has only been used once before -- after the Sept. 11, 2001, attacks in New York and Washington.

The Sukhoi Su-24, also known as a Fencer, is a twin-engine plane designed for low level airstrike missions.

The debacle underscores rising hostilities between Ankara and Moscow, as the two countries –- despite being strong trade partners –- have not seen eye to eye over Syria.

The state-backed Russian gas giant has suffered a massive decline in its value, losing over $300 billion since May 2008.

Authorities in Brussels have not released the names of the third and fourth people they charged in connection with the Paris terror attacks.

Alexei Ulyukaev said he expects Russia to experience 3.9 percent GDP decline in 2015, a rosier forecast than the World Bank's.

François Hollande and David Cameron are presenting a united front against the Islamic State group, but challenges remain, particularly with regard to Syria's Bashar Assad.

The American president has said that he will not allow the notion that his country is powerless to beat the Islamic State group.

A U.S. presidential envoy, speaking during a television interview, also said America would step up its offensive against ISIS to target its international networks.

Prime Minister Dmitry Medvedev said it was U.S. policy that led to the creation and growth of the Islamic State group.

The conflict with the Islamic State group will be ultimately resolved through diplomatic and political channels, the French army chief said Sunday.

More information has emerged about the brothers and cousins linked to last week's deadly attacks in France. Here's everything we know about them.

Different legal systems across the European Union and privacy concerns have complicated the mutual sharing of crucial information, observers say.

The anti-refugee protest, which usually draws crowds of 10,000 per week, saw an estimated turnout of 25,000 in its first rally after the terror attacks in Paris.