Basically, it's 30% people who think "Anyone doing anything Maidan-like, Kiev included, is wrong!", and 20% "Kiev is right, our seizures are wrong, Glory to Ukraine!"
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More then thousand was in Slavyansk alone, before they came to Donetsk. There were more volunteers but they did not have enough weapons for them, and various small cities are mostly defended by locals.
Recruitment reports are usually done by one group (as they don't have solid information about other group recruitment), and there are many separate groups operating there.
And it is. There are HUGE stockpiles of Soviet weapons that remained in Ukraine after USSR fall that were supposed to last YEARS in case of conventional war, plus more is driven east from Western arsenals and so could be captured.
Any movement of heavy weaponry across the border can be detected by satellites, and no satellite proof of heavy weaponry have been provided by any side.
As do Ukrainians; check recent criticism from Amnesty International on Lyashko:
http://www.amnesty.org/en/news/Impun...ine-06-08-2014
But local troops torturing and intimidating anyone who doesn't agree with them is okay?