Canadian Defence Minister Rob Nicholson said that a Russian military plane had circled over the HMCS Toronto in the Black Sea.
A total of 2,000 troops from nine countries – including the US, Canada and Italy – are taking in the exercises.
Obama said the United States would also try to involve Middle Eastern allies in a strategy to counter the jihadists.
EU and US officials said sanctions against Russia would be announced on Russia on Friday.
The Islamist group claimed responsibility for the attack.
“We will be more forthright in the defense of our values,” the leaders wrote.
bama says the Baltic nations lost their independence once before. He says with NATO, they’ll never lose it again.
Popov said that US and NATO leaders reassured Moscow that they are not Russia’s enemy and would never attack Russia.
US ambassador to the UN Samantha Power slammed Russian proposals to set up humanitarian corridors to east Ukraine.
Lungescu reiterated that Russia had to halt all such support and withdraw all its military forces on the border.
Greene was the highest-ranked American officer killed in combat in the wars in both Afghanistan and Iraq.
The govt said “heavily armed groups” have shelled “civilian targets,” endangering thousands of citizens.
Camron said NATO had to address the risks and challenges posed by failed states, regional conflicts, terrorism and cyber-attacks.
Obama discussed upcoming NATO Summit in Wale and Malaysia air downing with Polish President Komorowski.
The attack began around 05: 30 IST, no casualties have been reported so far, the interior ministry said.