Over the last two years, NNSA’s Office of Radiological Security (ORS) has focused on technical exchange relationships with peers in Europe and Asia. Bilaterally, these relationships offer mutually beneficial expertise, shared resources, and the opportunity to align radiological security priorities and improvements more broadly. These relationships can also be leveraged to improve radiological security regionally and even globally in countries with burgeoning radiological security programs. One case study demonstrating the potential of these exchanges is ORS collaboration with Japan. ORS has been partnering with Japan on regional training since 2020, when Japan invited ORS to support a radiological security workshop in Laos. Since then, Japan has become a regional resource for ORS training courses and has leveraged ORS curriculum for their own training programs. The partnership has created a multiplier effect in Southeast Asia, allowing both Japan and ORS to expand their reach and advance radiological security regionally.