The kingdom is one of several Southeast Asian countries to host a North Korean embassy, and once enjoyed valuable economic ties with the reclusive regime.
But the commerce ministry said today trade with Pyongyang had "plunged" and would soon be nonexistent as Thailand complies with UN resolutions to cut off North Korea in response to its increasingly powerful missile and nuclear tests.
During the first nine months of 2017 bilateral trade with North Korea amounted to USD 1.6 million, a 94 per cent decrease from the same period in 2016, according to the Ministry of Foreign Affairs.
The announcement came as US Special Envoy for North Korea policy Joseph Yun began talks today with senior Thai officials, including the National Security Council chief.
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Yun's visit is part of a December 11-15 trip to Asia - including a stop in Japan - "to discuss ways to strengthen the pressure campaign following the DPRK's latest ballistic missile test," the US State Department said, referring to the Democratic People's Republic of Korea, the North's official name.
The US remains frustrated that international sanctions on North Korea have not resulted in Pyongyang halting its nuclear and long-range ballistic missile tests.
But sanctions against North Korea have started to bite.
The UN Security Council ordered countries to stop providing guest work permits to North Koreans after Pyongyang's sixth nuclear test in September.
The ban impacts an estimated 100,000 North Koreans who send some USD 500 million in wages back to the authoritarian regime in Pyongyang, led by Kim Jong-Un.
The UN and the US have called on Southeast Asian leaders to do more to sever ties with North Korea.
But Washington has focused its efforts on Beijing, urging Pyongyang's longtime ally and economic lifeline to rein in Kim and his nuclear programme.
China has accepted a series of UN sanctions against Pyongyang but so far resisted calls to shut a crude oil pipeline considered crucial to North Korea's economy.
US President Donald Trump's administration has swung back-and-forth between contradicting approaches to the crisis on the Korean peninsula, with Tillerson adopting a more diplomatic attitude amid fiery rhetoric from the White House.
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