North Korea may be able to produce up to 14 to 18 nuclear warheads by 2019 if the multilateral talks for its denuclearization fail, a scholar said Tuesday. "If North Korea is able to refurbish its fuel fabrication plant, that production rate could continue indefinitely with its arsenal reaching 14-18 weapons by 2019," said Joel Wit, a visiting fellow at the U.S. Korea Institute at the School of Advanced International Studies, Johns Hopkins University, in a report. Wit was discussing the North's nuclear fuel reprocessing plant at its Yongbyon nuclear facilities being reactivated after it declared a boycott of the...