By AAMER MADHANI, COLLEEN LONG and ZEKE MILLER (Associated Press) WASHINGTON (AP) — President Joe Biden and South Korea’s Yoon Suk Yeol announced Wednesday the two nations will bolster the response to North Korea’s persistent nuclear threat with an agreement that includes plans to dock U.S. nuclear-armed submarines in South Korea for the first time in over 40 years, bolster training between the two countries and improve information sharing between the allies. The new extended nuclear deterrence effort was unveiled as Biden hosted Yoon for a state visit at a moment of heightened anxiety over an increased pace of ballistic missile tests by North Korea. Biden delivered a blunt warning to Pyongyang at an afternoon Rose Garden news conference with Yoon, saying: “A nuclear attack by North Korea against the United States or its allies and partners is unacceptable, and will result in the end of whatever regime were to take such an action.” Yoon said that the new commitment by the “righteous alliance” includes plans for bilateral presidential consultations in the event of a North Korean nuclear attack, the establishment of a nuclear consultative group and improved sharing of information on nuclear and strategic weapons operation plans. “Sustainable peace on the Korean Peninsula does not happen automatically,” Yoon said. Biden and Yoon aides have been working on details of the plan for months and agreed that “occasional” and “very clear demonstrations of the strength” of U.S.