Which research station on the Antarctic continent is operated by Russia?

Which of the following countries has a population density of over 1,000 people per square kilometer? What is the name of the largest ice shelf in Antarctica? What is the name of the Arctic city in Norway known for its Northern Lights displays? Which strait connects the Arctic Ocean to the Pacific Ocean? Which country has the most territory within the Arctic Circle? Which country has a territory that includes the northernmost point of land on Earth? What is the name of the largest river that flows into the Arctic Ocean? What is the name of the largest lake in Antarctica?