Although the media has a bunch of theories. This is what the Z and other symbols mean.
The Letter “Z” represents units in the Eastern Military District
The Letter “Z” in a square represents the Southern Military District (Crimea)
The Letter “V” represents the Russian Marines
The Letter “O” represents units from Belarus
The Letter “X” represents the forces of Ramzan Kadyrov, the Putin installed warlord of Russia’s Chechnya region.
The Letter “A” represents Russian Special Forces(SSO) like Spetznaz in its various operational units.
I'm currently in Washington DC
Film showing on the 5th
Horsmen minus Mike Jackman
It represents Zeus, The Ultimate Military Commander, ie: Vladimir Putin, who is the Master Military Tactician. Russian operations like this have no resemblance to the American Way of War, Shock and Awe, Bombing Countries to smithereens. Russia's way of War vacillates between Diplomacy and Warfare as recommended by Clausewitz, a German who was an Officer in the Russian Military. They don't just do, "Bombs Away", they Woo their Opponent until they submit.
So the Military Industrial Entertainment Complex can sell more World War Z movies and/or easier than listing all the countries in NATO? lol