Answer: Finland.
Some extra relevant information:
The nation closest to the North Pole is Russia. With its vast territory spanning across the northernmost regions of Eurasia, Russia extends up to the Arctic Ocean. The country’s northernmost points, such as Franz Josef Land and the Severnaya Zemlya archipelago, are located within a few hundred miles of the North Pole. These remote areas experience extremely cold temperatures and are characterized by ice-covered landscapes. Russia’s proximity to the North Pole has also been a significant factor in its efforts to explore and exploit the region’s valuable resources, such as oil and gas.