The sanctions were imposed by the U.N. Security Council.
During Pompeo's fourth visit to Pyongyang in October, he met with North Korean leader Kim Jong-un.
The chemicals to control pine tree diseases are not subject to UNSC sanctions on the North, it said.
In addition to disarming the DMZ, the measures also find the two sides conducting a joint project to excavate Korean War troop remains in the border region and setting up air, maritime and ground buffer zones.
The US has wound back its joint military exercises with South Korea, and North Korea has halted all missile and nuclear testing. It did not mention North Korea. The U.S. on Sunday also waved its separate sanctions to allow the survey to proceed.
US Defence Secretary James Mattis last week said the US and South Korea are reducing the scope of "Foal Eagle", a joint drill scheduled for spring 2019.
After the completion of the investigation, the North and South Korean trains - which will have traveled 2600 kilometers for 18 days - will return to Seoul, stopping at Wonsan, Pyongyang, and Kaesong.
Cheong Wa Dae had hoped that U.S.
Pompeo made the remarks during a telephone interview with a US radio station when asked about a working group recently launched between the USA and South Korea.
The First Lady defends ‘blood’ red Christmas trees
Trump shared the stage with CRTV host Eric Bolling , whose own son, Chase, tragically died of an accidental opioid overdose. Melania Trump thinks the media should focus on important issues instead of wasting time mocking Christmas decorations.
"The actual construction will be pursued according to progress in North Korea's denuclearisation", the unification ministry said.
Some believe that Washington may be attempting to keep North Korea in check.
"We are in frequent contact with North Korean officials". The propaganda website Uriminzokkiri said the US and South Korea should realize that "acting rashly" at a time of U.S.
Though Seoul and Pyongyang previously agreed to start a joint on-site survey of the Donghae and Gyeongui line, the schedule has since been delayed.
"It is a nod by the U.S.to Seoul's argument that the North needs to be given something for its gesture so far toward a reduction of tensions", Paal said.
South Korea plans to buy two Israeli early warning radar systems, it said on Tuesday, as it reinforces air defences against North Korea despite fast-improving relations.
Manning, however, doubts whether the rail survey exemption would be a sufficient incentive toward denuclearization. "So in areas where UNESCO works, which aren't subjected to sanctions, we can push ahead quickly and with determination", said a UNESCO source.
Despite apparent flexibility on sanctions, the US remains guarded.
Following the weekend announcement of a United Nations sanctions exemption, shares in South Korean companies linked to rail construction increased sharply-Korea Engineering Consultants and Yooshin Engineering by 30 percent.