Frankly, I believe the friends who actually fought there, hailing from the region, and volunteers both. Eye witnesses, you know. Since no one was able to prove involvement (satellites looking from above anyone?) such allegations are meant for people, who believe anything said to them by "independent media".
"A spokesman for the US Department of Defense stated that there was "no question" as to Russia's involvement in the attacks on Ukrainian Armed Forces. On 28 July it published satellite photos showing heavy artillery shelling Ukrainian positions from Russian territory."
"In late August, NATO released satellite images which it considered to be evidence of Russian operations inside Ukraine with sophisticated weaponry, and after the setbacks of Ukrainian forces by early September, it was evident Russia had sent soldiers and armor across the border and locals acknowledged the role of Putin and Russian soldiers in effecting a reversal of fortunes."
"The 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 were taking part in the conflict in Ukraine. In total, over 8,000 soldiers had fought there at different moments."
"Amnesty International considers the war to be "an international armed conflict" and presented independent satellite photos analysis proving involvement of regular Russian army in the conflict."
-From the article you clearly didn't read.
Polish army:
65,000 active duty personnel, 900 tanks, 1500 IFV, 150 helicopters.
Romanian army:
75,000 personnel, 1098 tanks, 1535 IFVs.
Russian army:
771,000 active duty personnel, 10,000 tanks.
Less than 20% of Russia's armed forces compromise more, then Romanian and Polish put together. Add in bigger experience, better air force...
That's some selective statistics you've got there.
You're talking about Russia, which still has a significant portion of its men and equipment woefully under-trained and ill-maintained, and an economy that can barely sustain itself in peacetime, vs. NATO. Which is:
Albania, Belgium, Bulgaria, Canada, Croatia, The Czech Republic, Denmark, Estonia, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, The Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Turkey, the UK, and the US.
Who does Russia have? The CSTO: Russia, Armenia, Belarus (which cooperates with NATO anyways), Kazakhstan, Kyrgyzstan, and Tajikistan.
Have fun with that.
According to what NATO generals?
If these guys actually exist they're probably low level and want more funding so they make Russia seem like more of a threat.