2009年3月，在美國“無瑕號”(USNS impeccable)事件發生後，菲律賓的政府號通過了一項法律，規定了一系列與其海域相關的基線。這項法律規定，菲律賓可以對斯巴達利斯群島和馬辛洛克群島等一些地區提出主權要求，但指的是不受新基線所包圍的島嶼制度。 2009年5月，馬來西亞和越南也向歐盟委員會提交了一份聯合聲明。這是大陸架的界限。而是他們的大陸架延伸到200海裡(海裡)以外，在這個區域已經有九條虛線指明了中國的區域。這遭到了中國的抗議。這導致了一系列由若干行動組成的相關事件鏈，其中包括許多國家的協調行動，這些行動導致了爭端的增加。
Other than this, the Attempts were made by Philippines in 1990 for the publication and internationalization of the dispute in order to call an action by the United Nations. However, it did notreceive the support from the neighboring nations, but the efforts for the perseverance of the cooperative solutions continued. In 2005, China, Philippines and Vietnam undertook joint surveys to gather the information about the oil and gas deposits over this region. Though, this was terminated in the year 2008 because of the number of domestic problems in Philippines and the ongoing internal disputes. Another reason for the same was that it was reported that China was forcing the companies in the foreign nations not to engage in exploration in the regions occupied by Vietnam. The conflicts between China and Philippines were instantiated after this. Also the conditions between China and Vietnam were getting worsened. China had started to make more and more assertive actions and concerns over the advancement in the military in this region.
In March 2009after the USNS impeccable incident, the government of Philippines, passed a law which led to the designation of a number of baselines related to its maritime zones. This law stated that Philippines can claim over some of the regions such as Spartlys and Bajo de Masinloc, but referred the same as the regime of islands which were not encompassed by the newer baselines. In the month of May 2009, Malaysia and Vietnam also came under a joint submission to the commission. This was on the limits of the continental shelf. It was that their continental shelf is extended beyond 200 nm (nautical miles) in such an area where there were already nine-dashed lines which were specifying the region of China. This was protested by China. This led to the sequences which consists of number of actions related chain of events, which included a coordinated moves by many nations who led to the increase in the disputes.