Trump’s G7 performance is a warning: Korea must rethink its diplomatic strategy
Chun In-bum
As U.S. foreign policy under President Donald Trump shifts further toward unilateralism and transactionalism, Korea faces a moment of strategic reckoning.
At the recent G7 summit, the world witnessed a stark reality: U.S. foreign policy under Trump is no longer guided by alliance solidarity or multilateral consensus. It is now driven almost entirely by a singular priority — constraining China’s rise.
Leaders from across the globe arrived at the summit hoping to secure face time with the U.S. president to discuss tariffs, trade or shared security interests. Instead, they left empty-handed. Ukraine, caught up in fighting with Russia, had hoped for American mediation towards a ceasefire, but Trump did not even meet with Ukrainian President Volodymyr Zelenskyy. Mexico, facing urgent issues related to refugees, narcotics and border security, received no substantive engagement.
All were left, proverbially, like “dogs chasing chickens,” to realize the prize had already flown.
This summit was more than just a diplomatic cold shoulder — it was a declaration. Under Trump, the U.S. expects allies to contribute concretely to Washington’s strategic competition with China. If they do not, they will be ignored. For G7 members, middle powers like South Korea and Mexico and even for close partners, the message was clear: either join America’s containment of China, or be relegated to irrelevance.
What should South Korea do?
President Lee Jae Myung’s administration is operating in an increasingly volatile diplomatic environment. Blindly aligning with Trump is risky. But ignoring him or clinging solely to multilateralism could provoke retaliation and result in strategic marginalization. A balanced, pragmatic and highly disciplined approach is now essential.
Above all, the Lee administration must move beyond ambiguity. Strategic hedging, a hallmark of past Korean foreign policy, is no longer sustainable in the world Trump is remaking.
There is little mystery in what earns Trump’s respect: tangible contributions to his goals. In foreign policy, that goal is defeating China.
If South Korea wants to remain relevant, it must demonstrate that it is not a passive observer but an active participant in the Indo-Pacific’s strategic reordering. This requires shedding the timid posture Seoul has long taken in the face of Chinese aggression — especially in the West Sea — and making bold, visible commitments to the U.S.-led containment effort.
Korea must take four strategic actions. First, increase defense spending and improve readiness. Korean defense spending should prioritize improved communication systems, realistic training, logistical readiness — especially in ammunition stockpiles — and the morale and welfare of the soldiers who serve.
Second, it should back the freedom of navigation in the South China Sea. While direct military involvement may be politically sensitive, diplomatic support and symbolic naval participation would send a clear message of alignment with international law and the broader Indo-Pacific strategy.
Next Korea should reaffirm its commitment to the Korea-U.S. Mutual Defense Treaty. The treaty remains the cornerstone of security and stability on the Korean Peninsula. But this treaty is mutual. While the primary mission of U.S. Forces Korea is the defense of Korea, it also has a broader mission of supporting U.S. national interests. Seoul must accept this reality and support the use of U.S. bases on the peninsula for wider regional contingencies.
Finally, Korea should reevaluate and restructure its economic dependence on China. Korea should restrict imports of Chinese batteries and core components, fully phase out Huawei and Chinese surveillance technology from public-sector use and incentivize businesses to shift supply chains to partners like Vietnam, India and Australia.
These are not just policy proposals — they are strategic signals. They tell Washington that South Korea is not a bystander, but a cornerstone of the Indo-Pacific alliance structure.
At the same time, Seoul should deepen its cooperation with G7 and NATO countries, many of which share profound concerns about China’s economic coercion and Russia’s military aggression.
Korea should attend the upcoming NATO summit and voice clear support for collective defense efforts — especially those aimed at deterring Russia. Participation in European Union-led dialogues on digital standards, supply chain security and trade enforcement would help cement Korea’s role as a trusted middle power and strategic partner.
The U.S. must also do its part. As much as these actions from Korea are critical, the United States must step up, too. If Washington wants a strong ally in Northeast Asia, it must treat Korea like one.
That means lowering tariffs or eliminating them altogether for Korean exports. It also means supporting Korea’s nuclear energy sector, including peaceful nuclear reprocessing under international safeguards.
All of this hinges on one factor: leadership. Do the U.S. and Korean governments have the diplomatic capability and political will to execute this vision?
Without real decisions, rhetoric becomes indecision. If Korea continues to hedge, it risks being distrusted by Washington and disrespected by Beijing — isolated in the very region where it should lead. Conversely, if the U.S. is perceived as overbearing, it will be seen as a bully, not a leader.
A shared decision for both nations is necessary. This is not merely a challenge for foreign ministries in Seoul or Washington. It is a shared national decision that requires the understanding and support of both the Korean and American people.
Korean citizens must recognize that being passive has a cost. Failing to clearly align with the free world could mean reduced access to critical technologies, weaker security guarantees and increased economic pressure. These costs will not be abstract — they will affect real families, industries and national strength.
The time to choose is now. Trump has made his expectations clear. In today’s world, diplomacy is no longer about polite conversation. It is about action, leverage and resolve.
Korea must now choose: Will it appease China and fade into geopolitical ambiguity? Or will it stand firm as a sovereign, active member of the rules-based international order?
And the United States must also choose: Will it be perceived as a bully? Or will it act as a trustworthy leader of the free world and a reliable ally that Korea can count on?
This is the hour of decision. History is shaped not by those who wait, but by those who choose to do the right thing.
Chun In-bum (truechun@naver.com) served as a lieutenant general in the Republic of Korea Army and was commander of Special Forces Korea.