I doubt that Perle criticized Putin for going after the real Chechen terrorists. More likely he criticized Putin for slaughtering many thousands of Chechen's who weren't terrorists.
About Denton and the chances he would vote for Kerry, I'll let Denton's words speak for themselves;
...People like Richard Perle and William Kristol can't even render a credible position on this matter, since they were both such ardent supporters of the Clinton administration when it sided with Islamic radicals in Kosovo against Slobodan Milosevic.
Perle was wrong about this.
When this kind of thing happens in places like Serbia or Iraq, Perle would call it "collateral damage."
Perle was wrong about this.
Has he ackowledged this? I really doubt it, because he was only "wrong" if you look at it in the context of the so-called "war on terror." The whole point of my posts is that Perle has never been terribly concerned about waging this war on terror. He's got his own agenda here, and I suspect -- based on the seemingly contradictory positions he has taken on Kosovo, Iraq, and Chechnya -- that fighting terrorism isn't part of it.
If you really want a good indication of this, do a search on the terms "Richard Perle," "al-Qaeda," and/or "Osama bin Laden." You'd be hard-pressed to find too many documents or statements in which Perle mentions the latter two even in passing.