What is the largest country by land area bordering the Arctic Ocean?

Which country has the longest land border with Russia? What is the largest country by land area in Oceania? Which country is the second-largest by land area in Africa? What is the largest country by land area in Central Asia? Which country is the largest by land area among the BRICS nations? What is the largest country by land area bordering the Black Sea? What is the second-largest country in the world by total area? What is the tenth-largest country in the world by land area?