Geopolitics has been in existence since the beginning of humanity. But as a concept embedded in governance and politics, its emergence and usefulness became necessary in the 19th century, especially as the newly industrialized nations of Europe seek to expand their influence far from home of origin. This was exercised through the acquisition of colonies that equally added their national strength.
Geopolitics has equally become increasingly important as military bases can be built closer to rival powers. These military bases are a means of deterrence to rival states. Weaker states can receive military protection from stronger states through the formation of alliances. This is the case in Asia Pacific, as the U.S and Vietnam (and other claimants in the South China Sea) can cooperate to contain china’s claims in the South China Sea
The militarization of islands in the South China Sea by China is a sign of growing strength, and a move to prevent the U.S from exploiting the alliance system and establish military bases around her territory. From these islands, she can monitor the activities of rival powers and push them away. This explains why China has remained assertive towards U.S military presence in the South China Sea. Chinese actions can be well explained by offensive realism.
It is therefore not the absence of cooperation between these states, nor the lack of liberal institutions to resolve the growing tension in the South China Sea, but it is as a result of offensive realism. China is therefore ready to push the U.S to the corner militarily in defense of her stands in the South China Sea. It is obvious that this would only lead to a further U.S military presence in the South China Sea.