Korea is probably the worst example of a dictatorship on earth

He has called North Korean dictator Kim Jong Un a "real leader" with whom he gets on "really well." North Korea is probably the worst example of a dictatorship on earth, with dissidents imprisoned in gulags and opponents performatively executed by a ruling family who are deified in state media.
Trump's love of strongmen doesn't stop with dictators. He's also applauded authoritarians in pseudo or partial democracies.

He congratulated Russia's President Vladimir Putin and Turkey's Recep Tayyip Erdogan on electoral triumphs that were declared by international electoral observers to be lacking in genuine competition and not fought fairly, respectively. In the case of Turkey, the vote was a constitutional referendum which handed Erdogan sweeping new powers.