The talks will also include the issue of recovering the remains of U.S. troops missing from the Korean War.

The media highlighted Trump’s surprise concession of halting joint U.S.-South Korea military exercises.

The two sides would join the negotiation tables expecting “quick, deliverable concessions.”

The details of the letter are not known but the gesture fuels optimism that the June 12 summit may go ahead.

North Korea has said it is still willing to give time and opportunity to the U.S. to hold face-to-face talks even after President Donald Trump abruptly cancelled a planned summit with its leader Kim Jong-un on Thursday.

Barbed remarks, including threat of a “nuclear-to-nuclear showdown,” from N. Korea’s vice Foreign Minister Choe Son-hui on Thursday added to a growing uncertainty over the fate of the proposed June 12 summit.

The uncertainty over the planned summit between the U.S. and N. Korea deepened on Tuesday after President Donald Trump said there is a “very substantial chance” that the historic event may not happen next month.

The U.S. President warned Kim Jong-un to either make a deal or face the fate of former Libya dictator.

In a blow to the groundbreaking diplomatic progress in the last few weeks, N. Korea threatened to pull out of a planned summit with U.S. President Donald Trump if Washington pursued “one-sided” deal.

N. Korean leader Kim Jong-un and his S. Korean counterpart Moon Jae-in pledged to “write a new chapter” in history as they held a landmark summit, aimed at restoring peace between the two nations, technically still at war.