SEOUL (Reuters) -South Korean President Yoon Suk Yeol said on Tuesday a new nuclear consultative group between South Korea and the United States would be a "starting point" to build a strong and effective deterrence against North Korea. Officials from the United States and South Korea are meeting on Tuesday in Seoul for the first Nuclear Consultative Group discussion, aimed at better coordinating allied nuclear response in the event of a war with North Korea. "Through a South Korea-U.S. alliance upgraded to a new nuclear-based paradigm, we will make substantial efforts to fundamentally block North Korea's nuclear and missile threats," Yoon told a briefing.