Kim Jong Un appeared to score an 'A+' victory — Trump's work is 'incomplete'

North Korea's Kim Jong Un and President Donald Trump both celebrated Tuesday's historic summit as a victory. But many experts see Kim, having won a substantial concession from the world's largest economy while simultaneously gaining greater claims to legitimacy, as the real winner.

Trump has been widely praised for calming tensions on the Korean Peninsula that threatened to escalate into full-blown conflict just six months ago. But, in the long run, his actions will only be a significant success if Kim delivers on his pledge to pursue complete denuclearization — a promise the authoritarian regime has made before.

"I suppose President Trump would get an incomplete ... for Chairman Kim Jong Un, it's an A+," David Adelman, former U.S. ambassador to Singapore, told CNBC on Wednesday.

Miha Hribernik, head of Asia research at consultancy Verisk Maplecroft, echoed that sentiment in a post-summit note: "Kim Jong Un emerged as the clear winner, having extracted a number of concessions from the U.S. in exchange for little of substance."

The country's ruler is now seen "as an equal" following Tuesday's summit, said Adelman. That's a major accomplishment for a state that's long been isolated from the international community.

When asked whether he regards Kim as an equal, the U.S. president on Tuesday said he didn't view the relationship in that way before saying he was willing to do "whatever it takes to make the world a safer place."

Equipped with praise from Trump, who multiple times called Kim "talented" and "smart," and a respectful reception from Singapore's government, North Korea's ruler now appears more accessible to the world despite a dark human rights record. That will likely work in his favor by cementing his legitimacy at home and severely weakening opposition to his regime, according to Hribernik.

The fact that Kim barely made any concessions on Tuesday is also a feather in Pyongyang's cap.

"By committing to work 'towards' the denuclearization of the Korean Peninsula, Kim has conceded no more than he did in the 27 April Panmunjom Declaration signed with South Korean President Moon Jae-in," said Alison Evans, deputy head of Asia Pacific Country Risk at IHS Markit.

Others pointed out that Tuesday's agreement bears remarkable similarity to previous U.S.-North Korea communiques. For example, a joint statement on June 11, 1993 also agreed to the principle of "peace and security in a nuclear-free Korean Peninsula, including impartial application of fullscope safeguards" but didn't detail any concrete steps on how to do so.

"Rather, the statement implicitly recognizes North Korea as a de facto nuclear weapons state," Evans continued.

And finally, Trump's decision to suspend scheduled U.S.-South Korea military exercises is another advantage to Pyonyang, which has long rebuked the annual drills. The move is "a substantial concession to North Korea's security concerns," Evans said.

Kim's Tuesday promise to dismantle a missile testing site just doesn't compare with Trump's offer to halt Washington's joint drills with Seoul, analysts said.