You are correct in they are in general national socialists, and Putin is responsible for shaping their national identity, but I would not say their economics are those of Fascism, those you will find far closer to home.
As for British involvement in Ukraine, that is empty posturing from Cameron. They may train a small army and arm them with IMF loans to be spent on US weapons in deals brokered by the UAE but this war, although a very long time in the planning in the US, will only end with Russia winning. How much blood gets spilt is up to our idiot leaders.