China and Russia on Monday signed a series of agreements to boost energy co-operation during a ceremony to open an oil pipeline between the countries. Leaders of the two nations agreed deals on gas supplies, energy efficiency, renewable energy and nuclear power.President Dmitry Medvedev is in China on a visit, where he and President Hu Jintao opened a pipeline that will supply Russian oil under a 20-year deal. The pipe connects Russian oil fields with Daqing, a major oil production base in northeastern China. Both sides hailed the move as a new era in co-operation.Russia's Deputy Prime Minister Igor Sechin told reporters in Beijing that Russia was in talks with China on plans to supply natural gas from 2015. Mr. Sechin said Russia is ready to meet China's full demand in gas. In August, Russia opened its section of a 1,000 kilometre oil pipeline from eastern Siberia to China.