WASHINGTON, March 25 (Xinhua) -- U.S. President Joe Biden Thursday warned the Democratic People's Republic of Korea (DPRK) not to escalate the situation while saying he is prepared to conduct diplomacy with Pyongyang.

In his first formal press conference since taking office, Biden told reporters that DPRK missile tests on Wednesday violated UN Security Council Resolution 1718.

"We are consulting with our allies and partners, and there will be responses if they choose to escalate, we will respond accordingly," he said.

"But I'm also prepared for some form of diplomacy, but it has to be conditioned upon the end result of denuclearization," he added.

When asked if the DPRK ranked the top foreign policy issue for his administration, Biden replied, "yes."

Senior U.S. officials said Wednesday that the DPRK fired two short-range ballistic missiles off its east coast. The launch followed Pyongyang's test of two short-range weapons on Sunday, which the Biden administration downplayed as normal military activity.

These tests came after South Korea and the United States conducted their annual springtime military exercises from March 8 to 18.

U.S. officials said Tuesday that the Biden administration is in the final stages of its policy review regarding the DPRK. National Security Adviser Jake Sullivan will discuss the issue with his counterparts in Japan and South Korea next week.

The White House said earlier this month that the Biden administration recently reached out to Pyongyang but had not yet received any response.

A top diplomat of the DPRK vowed that Pyongyang would ignore U.S. outreach until Washington "rolls back its hostile policy," the official Korean Central News Agency reported last Thursday.

"We have already declared our stand that no DPRK-U.S. contact and dialogue of any kind can be possible unless the U.S. rolls back its hostile policy towards the DPRK. Therefore, we will disregard such an attempt of the U.S. in the future, too," DPRK First Vice Foreign Minister Choe Son Hui said.