South Korea cannot provide the US with $350 billion in cash as suggested by Washington under a deal to lower tariffs, a senior official said.“Our position is not a negotiating tactic,” National Security Adviser Wi Sung-lac said in a Channel A News television interview on Saturday evening. “It is objectively and realistically not a level we are able to handle,” he added. “We are not able to pay $350 billion in cash.”Seoul and Washington agreed in July to a $350 billion investment pledge as part of a broader trade deal to lower US tariffs to 15% from 25%, but the two sides remain divided over how it should be structured. Read More: US, South Korea in Deadlock Over $350 Billion Investment FundSouth Korean officials are seeking loans and a bilateral currency swap arrangement with the US to soften the economic impact, noting that the sum represents more than 80% of its foreign reserves. US Commerce Secretary Howard Lutnick has reportedly told South Korean officials that Washington prefers the investment in cash rather than loans. President Donald Trump recently described the contribution as “up front.” Wi said the government is exploring alternatives and hopes for progress when the two leaders meet at the APEC Summit in Gyeongju next month.Separately, Korea’s Finance Minister Koo Yun-cheol told reporters Saturday that he has concluded talks with the US on the exchange rate and will announce details soon, Yonhap News reported, noting that the discussions are separate from currency swap negotiations.This story was originally featured on Fortune.com