Russia's provocative rhetoric and its dramatic expansion of flights by nuclear bombers are deeply troubling and dangerous.
A top NATO commander warned that "continual attacks" against Ukraine were hampering Kiev's efforts to modernise its army enough to one day join the Western military alliance.
US Secretary of State John Kerry warned Russia this was a critical time to fulfil a fragile peace deal to end the fighting in Ukraine.
Turkey called for determined action from NATO member states against the "significant" threat posed by Islamic State jihadists.
NATO head Jens Stoltenberg urged restraint by all parties involved in deadly clashes in Macedonia as violence erupted for a second day.
Western powers are getting set to counter an expertly crafted Russian disinformation campaign over Ukraine which has left them wrong-footed too many times for comfort.
The plight of migrants in the Mediterranean requires a "comprehensive response", NATO'S head Jens Stoltenberg said.
Top Russian defence officials lashed out at the USA, accusing it of undermining global security by funding revolutions and expanding NATO in a bid to contain Russia.
Finns are once again worried about the threat posed by their resurgent eastern neighbour Russia, though they remain firmly opposed to joining NATO.
NATO allies are scrambling to protect vulnerable Baltic partners from the threat of hybrid warfare, a Russian tactic that officials and experts say is based on deception rather than formal declaration of war.
Estonia's centre-left coalition is poised to return to power in an election marked by nerves in the NATO member over the military resurgence of Russia.
Russia could try to seize territory from NATO states off the back of fighting in Ukraine, the military alliance's deputy commander in Europe.
NATO defence ministers agreed to immediately set up six bases in eastern Europe and establish a spearhead force of 5,000 troops in response to Russian aggression.
Greece's new government remains committed to its NATO role despite close ties with Russia that have worried its allies.
NATO's military commander and Obama administration officials appear to be moving toward supporting sending defensive weapons to Kiev.
Visiting NATO chief Jens Stoltenberg warned authorities in mainly Muslim Kosovo of the danger posed by foreign fighters returning from Syria and Iraq.
NATO head Jens Stoltenberg said Russia had recently increased the flow of heavy arms and equipment into eastern Ukraine.
Starting from January 1 of this year, the Embassy of Estonia in Astana will serve as the contact point embassy of NATO in Kazakhstan.
A Canadian frigate with 250 marines on board set off from Halifax on the Atlantic coast to join NATO forces in the Mediterranean Sea monitoring the Ukraine crisis.
The Taliban responded scornfully to the formal end of NATO's war in Afghanistan, describing the US-led mission as a "fire of barbarism and cruelty".