The statements I have heard Trump say regarding Putin, are statements or respect. The last statement he called him a good leader. He was showing respect for his leadership skills. It doesn't mean that Trump in fawning all over Putin.
Trump goes much further than being diplomatic. He actually was on Russia Today (which is funded by the Kremlin) singing the praises of Putin.
Donald Trump defends Putin — on Putin's TV network Even the Trump campaign says it was a mistake.
For most Americans who have never lived in a communist country, but who are used to American media, they don't understand what state run TV really is about: propaganda. Not news, not even biased news. It's all about the message of the government. I have lived in a communist country as an American, and we were extremely careful to avoid being on state run TV or even having our image get into the hands of state run TV because they can and would use it as propaganda to promote their own purposes, not the truth. We didn't want to be mis-used to support things we didn't even know about.
Even if Trump wasn't singing the praises of Putin, it almost doesn't matter. Simply appearing on Russian TV to defend Putin and criticize America is so foolish and Russian media - aka the Kremlin - is running away with just the image of Trump being on Russia Today to promote Putin.
At the Commander in Chief Forum, Trump referred to Putin as “The man has very strong control over a country,” and “It’s a very different system and I don’t happen to like the system, but certainly, in that system, he’s been a leader, far more than our president has been a leader.” Trump also said Putin had an “82 percent approval rating.” (Sources: CNN, and
Why Donald Trump Can’t Stop Praising Vladimir Putin)
If Trump is doing all this to be diplomatic, it's really strange that Trump says that he would be different from Obama, and he would have just left the country and the G20 summit if they didn't have the right staircase for him.
Why is Trump's treatment of Russia and China so different, when they are both lead by strongmen and authoritarian style of leaders? I don't actually know why.
I think it might be because of the alt-right. They love Putin, but I honestly don't fully understand why.