SEOUL (NYTIMES) - South Korea said on Wednesday (Aug 22) that it would press ahead with its plan to open a diplomatic "liaison office" in North Korea this year, dismissing concerns that it was too quick in making overtures to the North Koreans, who have yet to begin dismantling their nuclear weapons programme.

When South Korean President Moon Jae-in held his first summit meeting with North Korean leader Kim Jong Un on April 27, they agreed to establish a joint liaison office - a potential first step towards building formal diplomatic missions - in the North Korean border town of Kaesong.

In a speech on Aug 15, Mr Moon said the opening of the office was imminent.

"In a few days," he said, "an era in which the two Koreas communicate with each other around the clock will commence."

But the conservative political opposition and the conservative news media in the South have since raised fears that Mr Moon's government is creating a rift with Washington by advancing inter-Korean relations when North Korea has taken no clear steps towards denuclearisation. They also questioned whether fuel oil and electricity, which the South plans to supply the office, would violate United Nations sanctions.

South Korea says the liaison office would not violate sanctions because it would provide no economic benefits for the North Korean government and would only help facilitate communications for denuclearisation efforts. Washington has so far said only that it wants inter-Korean relations to improve in tandem with efforts to denuclearise the North.

On Wednesday, Mr Moon's office characterised those concerns as mere "quibbling", given that 24 nations, including Britain and Germany, operate embassies in Pyongyang, the North's capital.

"I don't think it will be a big obstacle blocking the mighty stream" of diplomatic efforts engaging North Korea, said Mr Kim Eui-kyeom, a spokesman for Mr Moon.

South Korean foreign minister Kang Kyung-wha said on Tuesday that Seoul was still waiting for a "satisfactory" endorsement of the plan from Washington. Local news media interpreted her comment as an indication that there were differences between the allies over opening the liaison office.

Mr Moon has emphasised that he will coordinate closely with Washington on any effort to improve relations with the North and rid the peninsula of nuclear weapons. Mr Moon met Mr Kim, the North Korean leader, twice this year to help lay the groundwork for the latter's historic summit meeting with President Donald Trump in Singapore in June.

At the June meeting, Mr Kim committed to working towards the "complete denuclearisation of the Korean Peninsula". But talks between Washington and Pyongyang have since stalled over how to denuclearise North Korea.

In his speech last week, Mr Moon vowed to bolster South Korea's diplomatic engagement with the North.

Mr Moon is scheduled to visit Pyongyang in September for his third summit meeting with Mr Kim. Secretary of State Mike Pompeo has also planned to make a fourth visit to Pyongyang "soon". according to National Security Adviser John Bolton.

Since the summit meeting in April, Mr Moon's government has kicked off a series of inter-Korean projects aimed at easing tensions and building trust.

This week, the two Koreas are holding reunions for families separated during the Korean War. Mr Moon hopes to hold ground-breaking ceremonies this year for connecting railways across the border separating the countries.

He envisions integrating the two Korean economies, should the North denuclearise. Mr Moon said that the joint liaison office in Kaesong would help expedite these plans and others.

This week, South Korean defence minister Song Young-moo said that both countries' militaries had discussed removing 10 of their guard posts within the 4km-wide Demilitarised Zone dividing the peninsula.

Both armies operate dozens of heavily armed guard posts within the DMZ, although they are banned from doing so under the 1953 armistice that halted the war.

General Vincent Brooks, the top US military commander in South Korea, said on Wednesday that he supported any initiative to reduce military tensions along the border.

But Gen Brooks also warned that withdrawing the posts involved some risk - though "not an excessive amount" - in terms of US and South Korea's abilities to defend against the North.