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Eighty years ago, in the ashes of war, the world came together around a bold idea -- that peace, dignity, and prosperity are possible only when nations work together.Those words that open the UN charter, "We the peoples of the United Nations," still define who we are. The United Nations is more than an institution. It is a living promise, one that spans borders, bridges continents, and inspires generations.That promise is now again being tested. Conflict, climate change, inequality, and the erosion of trust are shaking the foundations of our societies.The world faces a fast-changing technological landscape -- from artificial intelligence to bioengineering -- that offers both hope and risk.At the same time, the human family is more interconnected than ever. What happens in one part of the world reverberates everywhere.Yet, in the face of these challenges, the lesson of the past 80 years still holds true: no nation can solve global problems alone. The climate crisis does not stop at borders. Pandemics and disinformation do not carry passports.The only path forward is through cooperation, dialogue, and shared responsibility -- in other words, through multilateralism.Time for RenewalAs we mark the UN's 80th anniversary, we are not just celebrating history; we are looking ahead. Earlier this year, the secretary-general launched the UN80 Initiative, the most ambitious reform effort in a generation. It aims to make the UN better equipped to respond to the complex realities of today's world.It also reinforces what remains unchanged: our shared commitment to the values of the UN charter -- peace, human rights, and sustainable development.This renewal comes as member states have also adopted the Pact for the Future, a global agreement to modernise multilateralism and make it more inclusive, accountable, and effective.Together, these two initiatives chart a path forward -- towards a United Nations fit for purpose and towards a world that works for everyone.Regional LeadershipThailand joined the United Nations in December 1946, becoming one of its earliest members. Since then, the country has contributed in many ways -- from peacekeeping operations to humanitarian action, gender equality, and human rights.Thai peacekeepers have served with distinction in some of the world's most difficult environments, embodying the nation's belief in shared responsibility and global solidarity.Bangkok stands as one of the world's true hubs of multilateralism -- home to the United Nations Economic and Social Commission for Asia and the Pacific (ESCAP), a cornerstone of regional cooperation and one of the UN's largest and most historic regional bodies.This makes Thailand not only a strong national partner but also one of the world's great multilateral capitals -- a bridge between global priorities and regional action.From climate resilience to universal healthcare, Thailand's leadership and openness to cooperation have helped drive progress across the Asia Pacific and beyond. Hosting numerous UN regional offices, Thailand continues to embody the spirit of partnership, dialogue, and shared progress that lies at the heart of multilateralism.Partnership in ActionHere in Thailand, all UN entities work together under the joint UN Cooperation Framework, partnering with ministries, civil society, academia, and the private sector. Together, we are supporting communities to adapt to climate change, advancing digital transformation, and promoting gender equality and inclusion.Whether it is protecting forests, expanding access to education, or supporting social protection for the most vulnerable, our work reflects a shared belief that progress must be inclusive and sustainable.Thailand has also presented three Voluntary National Reviews on its progress towards the Sustainable Development Goals -- a clear signal of its transparency and commitment to global cooperation.Through its Sufficiency Economy Philosophy, Thailand has shown that local values of sustainability can shape global thinking.Defending MultilateralismAs we celebrate this year's UN Day and mark our 80th anniversary, it is also a moment for reflection. Multilateralism is not an abstract concept - it is about how we solve real problems together. It is about the world we want to leave to the next generation.Standing up for multilateralism means standing up for peace over polarisation, cooperation over competition, and trust over division. It means believing that we are stronger together.Looking to the FutureAs the UN Secretary General Antonio Guterres has highlighted, the challenges of our century demand a United Nations that listens more, delivers faster, and acts with courage.This also requires nations, communities, and citizens who are willing to work together in good faith. As we look towards the next 80 years, let us renew the promise of "We the Peoples" -- the promise that peace, dignity, and prosperity are possible when we act as one.On this United Nations Day, I extend my deepest appreciation to the Royal Thai Government, to our member states, and to the people of Thailand for their steadfast partnership and belief in multilateralism.The story of the United Nations is one of perseverance, partnership, and hope.Together, let us continue building a world that reflects the best of humanity -- one where no one is left behind.Published to mark United Nations Day and the 80th anniversary of the UN on 24 October 2025, this op-ed is authored by Michaela Friberg-Storey, Designated Representative of the UN Secretary-General and UN Resident Coordinator in Thailand.This was originally published by Bangkok Post.