The Johnson stuff, to me, is irrelevant. He's not a serious contender for the President, and as a 3rd party candidate, his only role in this election is to push his party's agenda. And his party's agenda is mostly domestic. So it honestly doesn't matter what his thoughts are on Syria because, in the long run, it doesn't matter.
As a former journalist, I was also a bit disturbed by the way that question was phrased. “What would you do if you were elected about Aleppo?", to me, is a question designed specifically to get the response that Johnson gave. Because the question had little to do with the city of Aleppo and more to do with the Syrian refugee issue as a whole. It would be like asking "What are you going to do about Raqqa?" when you're actually asking what you would do about ISIS.
Regarding Putin, Trump is an idiot, but Putin isn't going away. So what should be the US' policy on Russia? If you go to Hillary's website, there's a ton of issues she talks about. Nothing in there about Russia. So while they're saying Trump would let Putin bully him, what's the alternative? World War 3? A second cold war?
There's thoughts that Putin in supporting Trump because he's worried about Hillary. She's a known war hawk who's already responsible for the death of one of Putin's allies (Gaddafi), and who's openly wanted to get rid of another of one his allies (Assad). And while "a bad person with bad friends is afraid of her!" sounds like a great reason to vote for Hillary, do we really want a scared Vladamir Putin? Is that really in the best interests of anyone in the world?
Again, Trump is an idiot, but it's another instance where I'm not sure Hillary really looks much better. It's just a terrible election with two terrible candidates.