This has been repeatedly explained: he was not jailed for what he said. His very offensive comments should not get him jailed but with those words in mind, do you think he deserve the nobel peace prize?
If you are interested in how he was jailed, search google, there are tons of articles there.
Hello, I did google it and all I got was he was jailed for 11 years after being convicted of a mysterious charge called "Inciting subversion of state power (煽动颠覆国家政权罪)".
It's not a charge that means a lot to those educated in the west, who would probably view it as a thought crime charge.
Hmm, if Trump speaks for the Russian, persuading the Americans that the US should be colonized by the Russians for 300 years, would you think he should be free doing his presidential business? Especially after he (for example's sake) got awarded some Russian prizes?
If he only expresses some views of his, it's probably OK if he's not influential. If he got awarded some prize that's important worldwide and sometimes awarded to POTUS, well, it's totally a different thing.
If you are interested in how he was jailed, search google, there are tons of articles there.