WASHINGTON-- A South Korea's national security adviser insisted on Tuesday that the US may not have had any ill intentions when it possibly eavesdropped on conversations at Seoul's presidential office.

Kim Tae-hyo, principal deputy national security adviser, also said the allies believe a "large portion" of the classified documents believed to have leaked from the US Department of Defense may be fake.

"Currently, a third party is implicated in a large part of this incident and there exists no circumstance that our ally, the US, has done this with some kind of malicious intention toward us," Kim told reporters after arriving in Washington.

Kim is here for talks with his US counterparts on South Korean President Yoon Suk Yeol's state visit, which is slated to begin April 24.

However, Kim's visit also comes after two US newspapers -- New York Times and Washington Post -- reported that leaked classified documents from the Pentagon showed US intelligence services may have eavesdropped on conversations at the South Korean presidential office in early March to determine whether South Korea may provide lethal assistance to Ukraine.

Kim earlier said a great deal of the disclosed information appears to have been fabricated.

He repeated the same view when speaking to reporters in Washington, saying, "the view of South Korea and the US is aligned that a great deal of the disclosed information is fabricated."

Kim also said he had no message to deliver to the US on the issue when asked, saying, "because someone has fabricated" the documents.

John Kirby, strategic communications coordinator for the US National Security Council, said on Monday that the US is analyzing the leaked documents for their validity and that the country is engaging with the relevant allies and partners to ensure them of US commitment to their defense.

On the upcoming meeting between Yoon and President Joe Biden, set to be held April 26, Kim said South Korea will do its utmost to strengthen US extended deterrence as an outcome of the bilateral summit. (Yonhap)