This is a well documented recent history of the land and it’s troubles. Many are saying now that the US-Russian interests are petroleum related again with competing proposals for natural gas pipelines to either send supply to Europe or Russia. Europe is heavily reliant on Russian oil and gas and their pipeline would relieve pressure on them from Russia. Conversely, Russia is trying to maintain it’s power over Europe. The invasion of the Crimea was a phase of this that allows Russia to control key water ways in the Black Sea. While Syrians may feel that this is over ancient hatred and more recent colonial interference in their natural, historical and religious identity to Superpowers it is still about controlling resources.