The 21st century is marked by changes in matters of power balancing and system polarity, which could be explained by Geopolitical theories. In this paper, we intend to investigate how the classical Geopolitical theories – such as the Heartland/Pivot Area theory, wrote down by Halford J. Mackinder, and the Sea Power theory, wrote down by Alfred T. Mahan – could be faced and readapted amid the new settles of strategic routes and military development needs, brought by the ice-melting of the Arctic Ocean. The study cases will concentrate on Russia and China, due to their recent investments in the opening of new strategic routes for navigation and trade, including the Arctic routes, demanding inputs on technologies, transport innovation, and military emulation. Working on a qualitative method, with analysis of primary sources (such as government documents on strategies for the Arctic), and secondary sources (such as books, articles, interviews and other published materials on the topic), we hypothesize that: (i) the classical theories never predicted the ice-melting of the Arctic Ocean, perceiving it as a natural shield, and not as a navigable pathway; (ii) that the Arctic defrosting opens up new strategic routes for other countries besides Russia and China, like Canada and the United States, emerging a new conflict spot due to their different interests around this opportunity. Based on that, the preliminary results point out that: (i) it is not possible to apply the classical theories of geopolitics to these new configurations of the international system, without at least a reinterpretation/readaptation to the current context, which would alter all the power dynamics predicted by its authors; (ii) Russia and China are readequating themselves to this new scenario, in order to gain some advantages in a hypothetical dispute for the Arctic control.