Science in the Arctic — and Greenland — is on the frontline of pressing challenges facing humanity, like climate change and genetics. But some old barriers rose again when Russia invaded Ukraine in 2022, freezing decades of shared science in the Arctic. Scientists have collaborated for decades to study environmental change, ice sheet and glacier loss, and the complex web of land and marine ecosystems in Greenland and across the Arctic. Science in the region has already been affected, and scientists are worriedThough Trump's position on Greenland has seemingly cooled, for now, scientific concerns have not. A frontier for a different type of diplomacyPrograms like INTERACT — and Arctic research generally — are forms of science diplomacy.