Arctic oil exploration: Rosneft and ExxonMobil this week agreed to jointly develop two zones on Russia’s continental shelf, Ust-Lensky in the Laptev Sea and Severo-Vrangelevsky in the Chukchi Sea. The two companies have also agreed to work together to explore the 200,000km² Severo-Karsky block in the Kara Sea. RIA Novosti