North Korea warned President Donald Trump yesterday not to listen to United States critics who were disrupting efforts to improve ties, as its leader, Kim Jong Un, made his way across China by train to a second summit with Trump in Vietnam.

The two leaders will meet in Hanoi on Wednesday and Thursday, eight months after their historic summit in Singapore, the first between a sitting U.S. president and a North Korean leader, where they pledged to work toward the complete denuclearization of the Korean peninsula.

But their vaguely worded agreement has produced few results and U.S. Democratic senators and U.S. security officials have warned Trump against cutting a deal that would do little to curb North Korea’s nuclear ambitions.

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The North’s KCNA state news agency said such opposition was aimed at derailing the talks.

“If the present U.S. administration reads others’ faces, lending an ear to others, it may face the shattered dream of the improvement of the relations with the DPRK and world peace and miss the rare historic opportunity,” the news agency said in a commentary, referring to North Korea by the initials of its official name, the Democratic People’s Republic of Korea.