US President Joe Biden and South Korean President Yoon Suk-yeol are expected to agree on strengthening Washington's extended deterrence against North Korea at an upcoming bilateral summit.

Yoon is visiting Washington as a state guest. The two countries are marking the 70th anniversary of their alliance this year.

In a summit due to take place on Wednesday, Biden and Yoon are expected to discuss extended deterrence amid the acceleration of North Korea's nuclear and missile development.

Extended deterrence refers to Washington's commitment to deter and defend US allies with its military power, including nuclear weapons.

A high-ranking official of the Biden administration told reporters on Tuesday that the two leaders will release a declaration on how they will prepare for unpredictable events. The official said the declaration calls for the creation of an information-sharing framework regarding nuclear arms. It reportedly incorporates possible calls at South Korean ports by US nuclear-powered submarines that can be armed with nuclear weapons.

The official explained that these efforts are aimed at making US nuclear deterrence efforts more visible to maintain the peace and stability in the region.

The official added that Washington and Seoul remain unchanged in seeking to resolve the issues surrounding North Korea through diplomacy.

There is skepticism in South Korea about the credibility of US nuclear deterrence.

Biden and Yoon are apparently trying to allay these concerns by issuing a strong message. Pyongyang will most likely react sharply to these moves.