Reposting this article about Chinese vs Russian competition for central Asian Gas. It also includes this passage:
the Chinese have never forgiven Russia for seizing East Siberia under the Tsars, the “lost territories”. They want their property back, and they are getting it back by ethnic resettlement across the Amur and the frontier regions, much as Mexico is retaking California and Texas by the Reconquista of migration.
The population of far Eastern Siberia has collapsed to 6.3m from over 8 million twenty years ago, leaving ghost towns along the Trans-Siberian Railway. Russia has failed to make a go of its Eastern venture. With a national fertility rate of 1.4, chronic alcoholism, and a population expected to shrink by 30m to barely more than 110m by 2050 — according to UN demographers, not Mr Putin’s officials — the nation must inexorably recede towards its European bastion of Old Muscovy. The question is how fast, and how peacefully.