 Russia has used Central Asia's gas, primarily that from Turkmenistan, on occasions where it has found itself unable to meet all its delivery obligations from its own production.For example, in 2000 Gazprom allowing Turkmenistan to use its pipelines to supply gas to the Russian domestic market, to enable Gazprom to fulfil its obligations to European customers.Historically, the Medvezhye, Urengoy and Yamburg gas fields have made up the bulk of Gazprom's production.