The call was the first that Moscow accepted, according to NATO.
The Kremlin's military holiday coincides exactly with the day that pro-Russian forces took control of Crimea.
Russia's Youth Army hopes to get youngsters enthused about Soviet military glory.
Russia's minister of defense said propaganda must be "smart, competent and effective."
The last three years have seen high support for conscription.
Mattis said the U.S. should ensure its diplomats "negotiate from a position of strength."
Moscow has already ordered more than 10,000 medals for the conflict.
The ministry's pages are intended to inform Arab speakers on the "humanitarian situation" in Syria.
'The Adventures of the Little Tank' is not a mistranslation of 'Thomas the Tank Engine.'
The Kremlin is not concerned by a reported border deployment but parliament promises response.
Abkhazia and South Ossetia consider themselves independent from Tbilisi.
Russia's strategic missile troops will conduct 150 drills in 2017.
The calendar is dedicated to Russia's troops and features young Syrian women with puns and quotes such as "The fate of my Palmyra is in your hands."
Ruslan Galitsky is the 23rd Russian national to be officially confirmed dead in Syria.
Atambayev says Russian troops must one day leave, even if "certain people" do not like it.
Putin is keeping an eye on proceedings and reports suggest Russian missile defenses in Crimea are at the ready.
Rostec says it logged thousands of suspicious cyber-incidents last year.
Russian and Belarusian paratroopers are to take part in drills in the Balkans.
Iskander units were drafted in the exercise close to the Estonian border.
The paratroopers are an elite unit of the Russian military, with great significance in the Ukraine conflict.
Paratroopers will test out a new uniform for combat in extreme desert conditions.
Three bombers reportedly flew under a civilian aircraft with their transponders switched off.
Almost 5,000 Russians voted from Syria, which is four times higher than usual.
Kiev's military intelligence claims Russian strategic missile forces are carrying out drills.