The U.S. and North Korea are reportedly seriously considering exchanging liaison officers, an important step towards building formal diplomatic relations. 

CNN issued the report on Monday quoting two high-level diplomatic sources with knowledge of the discussion. 

The two diplomatic sources said the first step towards establishing a new U.S.-North Korea relationship could be the exchange of officers.

The U.S. would send several liaison officers to set up an office in North Korea, which would be led by a senior Korean-speaking Foreign Service officer. 

This report comes days ahead of the second summit between U.S. President Donald Trump and North Korean leader Kim Jong-un set for next Wednesday and Thursday in Vietnam.