invulnerability to land invasion. As Eurasia began to be covered by an extensive network of railroads, there was an excellent chance that a powerful continental nation could extend its political control over the Eastern European gateway to the Eurasian landmass. In Mackinder's words, "Who rules East Europe commands the Heartland." A Russo-German alliance. Before 1917 both countries were ruled by autocrats (the Tsar and the Kaiser), and both could have been attracted to an alliance against the democratic powers of Western Europe (the US was isolationist regarding European affairs, until it became a participant of World War I in 1917). Germany would have contributed to such an alliance its formidable army and its large and growing sea power. Conquest of Russia by a Sino-Japanese empire (see below). The combined empires' large East Asian coastline would also provide the potential for it to become a major sea power. Mackinder's "Who rules East Europe commands the Heartland" does not cover this scenario, probably because the previous two scenarios were seen as the major risks of the nineteenth century and the early 1900s. One of Mackinder's personal objectives was to warn Britain that its traditional reliance on sea power would become a weakness as improved land transport opened up the Heartland for invasion and/or industrialisation (Sempa, 2000). A more modern development to which the heartland theory can still be attributed to exist is through Russia's oil pipelines scandals. Heartland theory implies that the world island is full of resources to be exploited. "Any initiative by the United States to open the market access in Central Asia implies that this state is targeted for the exploration of multinational energy companies. The efforts for domination of the exploration of natural resources are also apparent in the case of Russia. Study found that Russia wants to have pipelines pass through its own territory. However the Russian energy companies are working on behalf of market interests, they often constrain the behaviour of the state". Influence on other geopolitical models Signs of Mackinder's Heartland Theory can be found in the works of geopolitician Dimitri Kitsikis, particularly in his "Intermediate Region" model. There is a significant geographical overlap between the Heartland or "Pivot Area" and the Intermediate Region, with the exception of Germany-Prussia and north-eastern China, which Kitsikis excludes from the Intermediate Region. Mackinder, on the other hand, excludes North Africa, Eastern Europe and the Middle East from the