Beyond headlines: Seoul’s post-APEC challenge

Soo Kim

The 2025 Asia-Pacific Economic Cooperation summit unfolded like a model spectacle of soft power. For a few days in the last week of October, Gyeongju, once the capital of ancient kingdoms, captured the world’s attention as the center of modern diplomacy and global commerce. We saw handshakes between world leaders, photo ops and K-pop stars hyping the event. Notably, the sight of three billionaires — Nvidia’s Jensen Huang and the heads of Samsung and Hyundai — walking into a neighborhood chicken joint brought a mix of gravitas, pop culture and whimsy to the summit week, underscoring the convergence of high-stakes diplomacy and moments of spectacle at APEC.

As the saying goes, though, not all that glitters is gold. Once the dust settles and the fog dissipates, the true measure of APEC’s success will be determined not by CEO sightings or dazzling star power, but by the far less glamorous, less visible work that follows: the mechanics and implementation that translate handshakes, words and promises into policy.

To be clear, symbolic gestures do carry significant weight in underscoring a country’s global influence. APEC, for its part, offered clear proof of Korea’s international recognition — celebrities and cuisine on the global stage, heads of mega corporations mingling and sharing candid moments, multilateral photo ops against the backdrop of Gyeongju and its UNESCO World Heritage sites, capturing fragments of South Korea’s history, soft power and journey to international standing.

But we all know these symbols are not the levers that move trade relations or enhance national security, two issues that have been top of mind for South Korea in recent months. And it was in this context that the summit between Presidents Lee and Trump drew attention. The world watched as the two leaders exchanged smiles and gifts, shaking hands on tariffs, industrial cooperation and the prospect of nuclear-powered submarines.

However, the meeting’s spectacle belied its true weight and potential impact. The mechanics of these agreements — on issues of consequence for Seoul’s economy and national security — have not yet been revealed. Until the formal terms are inked and codified in writing, the net benefit for Seoul, Washington and their seven-decade alliance remains opaque.

In July, South Korea and the U.S. agreed in principle to Seoul investing $350 billion in the U.S., but the parties had been deadlocked over the fine print of the agreement for months. At APEC, Trump and Lee announced that the cash portion of Seoul’s investment package would be split into annual installments of $20 billion over 10 years. The two sides also announced that the reciprocal tariff rate will be dropped from 25 percent to 15 percent. The rate does not apply to all sectors, however.

The monthslong negotiation process over tariffs underscores the gap between headline-ready moments and tangible, substantive outcomes. In the weeks leading up to APEC, public updates were sparse and largely internal. The outcome illustrates how optics can crystallize long before the actual mechanics and follow-through become visible to the public. To the South Korean and American public, what matters is less the announcement itself than how these commitments will be translated into concrete policy and impact their daily lives.

The same is true for Seoul-Washington security cooperation, namely the discussion of nuclear-powered submarines. The announcement by the two leaders suggested broad U.S. support for South Korea’s strategic ambitions — and concerns — but key questions remain unresolved. For one, it’s unclear whether Seoul will be building the submarines domestically while receiving U.S. nuclear fuel, or rely on U.S. shipyards as President Trump suggested.

President Lee communicated his position that Seoul wants to build the ships domestically and receive enriched uranium from the U.S. to use in the vessels. Trump said that Seoul would be “allowed” to possess nuclear-powered submarines, which would be built at a South Korean-owned shipyard in Philadelphia, implying that Seoul might only be able to purchase and operate U.S.-built vessels, with no nuclear technology or fuel transfer permitted. Should that interpretation hold, this could significantly impact Seoul’s long-term defense planning and security.

For Seoul, its greatest challenge post-APEC lies in navigating these headline moments while maintaining strategic coherence. The key test is in converting these announcements and provisional understandings into actionable policies, ensuring that investments, industrial cooperation and defense initiatives are implemented effectively and to the benefit of Seoul’s long-term interests and shared alliance goals.

How Seoul translates the momentary visibility gained from APEC into lasting outcomes — a tall order of balancing alliance commitments with regional sensitivities, plus maintaining a viable domestic narrative — will determine its true influence as a key global contributor. The work that follows, which includes finalizing negotiations, coordinating across ministries and with alliance counterparts, and tethering policy to impact on daily lives, will determine the success or failure of the summit.

Summits are designed to be highly symbolic. In most cases, they succeed in this respect. The issue arises when the lines between optics and substance are blurred. In modern diplomacy, it is easy to mistake headlines for substance while the real work remains stalled in ambiguity. Thus, the spectacle of APEC was just the opening move; its true impact will be measured over time and in the follow-through of the details. Until then, it remains an abstract rather than a substantive achievement.

Soo Kim is a former CIA analyst and strategic risk consultant.