Ukraine displays captured Russian weapons that prove direct Russia's involvement in the conflict in the Eastern Ukraine.
The Chicago Council on Global Affairs estimates the Russian separatists forces have around 36'000 troops (as compared to 34'000 Ukrainian) and out of that 8'500-10'000 are purely Russian soldiers. In addition to that, there are around 1000 GRU troops operating in the area. It also stated that the Russian separatist side enjoys technical advantages over Ukrainian army since the large inflow of advanced military systems in mid-2014: effective anti-aircraft weapons ("Buk", MANPADS) suppress Ukrainian air strikes, Russian drones provide intelligence and Russian secure communications system prevent Ukrainian side from communications intelligence. Russian side also frequently employed electronic warfare systems that Ukraine doesn't have. Similar conclusions about technical advantage of the Russian separatists were voiced by Conflict Studies Research Centre.
Center for Eurasian Strategic Intelligence estimated, based on "official statements and interrogation records of captured military men from these units, satellite surveillance data" as well as verified announcements from relatives and profiles in social networks, that over 30 Russian military units are taking part in the conflict in Ukraine. In total, there was over 8 thousand soldiers fighting there at different moments.
In November 2014, Armament Research Services published a detailed report on arms used by both sides of conflict, documenting a number of "flag items". Among vehicles they documented presence of T-72B Model 1989 and T-72B3 tanks, armoured vehicles of models BTR-82AM, MT-LB 6MA, MT-LBVM, and MT-LBVMK, and an Orlan-10 drone and 1RL239 radar vehicle. Among the ammunition, they documented 9K38 Igla (date of manufacture 2014), ASVK rifle (2012), RPG-18 rocket launchers (2011), 95Ya6 rocket boosters (2009) MRO-A (2008), 9M133 Kornet anti-tank weapons (2007), PPZR Grom (2007), MON-50 (2002), RPO-A (2002), PKP (2001), OG-7 (2001), and VSS rifles (1987). These weapons, manufactured in Russia, were seen in the zone of conflict used by pro-Russian separatists, but never were in the Ukrainian government inventory.
Since counting began on September 1, 2014 until June 1, 2015, the European monitoring mission on the Russian side of the border has recorded 20,021 men in military uniforms crossing to and from rebel-controlled eastern Ukraine.
There is also evidence that indicates the Buk missile system, widely believed to have been used to shoot down Malaysia Airlines Flight 17 on 17 July, came from Russia. Russia is the only country in UN which voted against international tribunal on that matter.
In September 2015 OSCE monitoring mission spotted Russ ian TOS-1 "Buratino" thermobaric weapon launchers in separatis training area near Lugansk.
According to Forbes, Russian government have Inadvertently posted Casualties In Ukraine: 2,000 Deaths, 3,200 Disabled.
I have to remind, that because of Putin's military intervention in Ukraine and his plan to rebuild red soviet empire, dozens of thousands of Ukrainian people are already dead.
