ROK President Moon Jae-in delivers his New Year's address at the presidential Blue House in Seoul on Jan 11, 2021. (YONHAP / AFP)

SEOUL - The Republic of Korea’s President Moon Jae-in said on Friday that the two Koreas and the United States should make efforts to continue dialogue, not create difficulties.

READ MORE: DPRK says it launched 'newly-developed' missiles

Moon's remarks came after US President Joe Biden said he is open to diplomacy with the Democratic People's Republic of Korea but warned that recent missile tests had violated international rules and could prompt response if Pyongyang continues.

“There will be responses if they choose to escalate,” Biden said Thursday at a White House news conference. “We will respond accordingly.”

The official Korean Central News Agency reported Friday that the DPRK had launched two "newly-developed" tactical guided missiles, which was "very successful just as it had been confidently predicted."

ALSO READ: Biden warns against DPRK escalation, offers diplomacy

The Republic of Korea's Joint Chiefs of Staff said Thursday that the DPRK has fired two unidentified projectiles into the East Sea.