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South China Sea: Beijing watches as The Hague ruling looms

China is set to hear some major news on Tuesday, and it's likely to have a profound impact on the busiest commercial waterway on earth.

A tribunal at the Permanent Court of Arbitration in The Hague, Netherlands, is expected to rule on a dispute between China and the Philippines, and that decision — and the responses of both those countries and others — could be one of the most significant geopolitical events in years, according to experts.

What's happening

The Philippines brought an arbitration case in 2013 over disputes in the South China Sea, eventually lodging 15 claims against China related to the U.N. Convention on the Law of the Sea (UNCLOS) — a critical piece of international law that both countries have ratified.

China claims almost all of the South China Sea, a massive body of water that stretches about 1,200 miles from the Chinese mainland. The sea comprises a massive 1.4 million square miles and is abutted by eight countries with a combined population of about 2 billion people. Those waters handle about half of the world's daily merchant shipping, a third of global oil shipping, two-thirds of all liquid natural gas shipments and more than a tenth of the Earth's fish catch.

Many countries object to China's claims to the region. The Philippines essentially decided to take China to court over them.

China has refused to to participate in the arbitration process — although a 2014 position paper from Beijing was seen as an unofficial argument in the matter — but UNCLOS specifically allows for a tribunal to make legally binding decisions even if one party is absent.

How China upset the Philippines in the first place

China's maritime claim is intentionally ambiguous: Although the nation periodically presents maps with sketches of the boundary — the so-called nine-dash line — it has never explicitly given geographic coordinates, or even explained to what extent it is claiming ownership over the area.

"China's goal has always been, and remains, to avoid any clarification of its claims," said Greg Poling, director of the Asia Maritime Transparency Initiative at the Center for Strategic and International Studies. "It doesn't want other claimants or the international community to know what it's claiming so it can change it at any point."

The nine-dash line has allowed China to claim a right to do things ranging from drilling for oil to actually creating man-made islands — without providing anything specific that other nations could argue against. Tuesday's arbitration ruling could make it increasingly difficult for Beijing to play that game.

According to one theory, China's South China Sea island-building and its deployment of naval and air power in the area could signal that it is hoping to turn the entire zone into a Beijing-controlled "strategic strait."

The Philippines claims that direct negotiations with China proved to be a dead end — and the Philippines certainly can't persuade China with military might. Similarly, the other nations in the region have made little headway with China concerning their own competing South China Sea claims. Beijing insists on one-on-one negotiations, and no one can stand up to China by themselves.

An international tribunal ruling against the nine-dash line would go a long way toward offering a framework for a unified front against China, and that is something that worries Beijing, experts said. Such a decision could "give more hope to the Philippines and other Asian countries that claim territory in the South China Sea," according to Andrew Scobell, a political scientist at the Rand Corp.

Beijing fears a blow to its global reputation if it is seen as flouting international law, but on the other hand the Chinese Communist Party would have a hard time explaining any acquiescence to a Chinese population that's been drummed into a nationalistic fervor over the issue.

"The power of international law is primarily reputational and measured in terms of legitimacy," Mira Rapp-Hooper, a senior fellow in the Asia-Pacific Security Program at the Center for New American Security, told CNBC earlier this year, when China's island-building in the region came under scrutiny. "My speculation would be that China has basically calculated that it will take some near-term, rather assertive actions in the South China Sea, and pay short-term reputation costs in exchange for what it believes to be longer-term strategic gains."

Many Chinese, politicians and regular citizens alike, see opposition to their South China Sea claims as opposition to their ascendance on the world stage.

"China is a rising power and it is feeling restrained by U.S. military presence in the Western Pacific," said James Keith, former China director for the National Security Council. "China is fighting back against American dominance as it tries to carve out a place for itself in the region."

Why it matters in the US and beyond

In general, many nations are watching the ruling — and China's reaction to it — as a watershed moment for international law.

Most experts who spoke with CNBC said they expect the tribunal to rule against China — although others have said that the ruling may be more limited than is widely expected. But no matter what the tribunal decides, China has said that it will not abide by it. Still, experts said a big legal victory for the Philippines could serve as a bargaining chip against Beijing in any future disputes.

"Big picture: The ruling is going to be critical in the long term, but it doesn't change anything on July 13," Poling said. "China's not going to suddenly roll over and say, 'You got me.' But if you're looking for how to pressure Beijing in the long term, (China will) have it hanging over its head."

About 40 countries, including the United States, have indicated officially that they expect China to abide by the ruling, by Poling's count, so China would presumably lose political capital with those nations if it continued to act in opposition to any tribunal decisions.

Washington recognizes the commercial and strategic importance of the South China Sea itself, but foreign policy experts — and politicians themselves — emphasize that the most critically important element of the South China Sea dispute is maintaining a rules-based approach to international conflict.

"This is a tremendous source of frustration for the U.S. government: How do we counter what China is doing?" Scobell said, adding that the White House has not come up with "an effective solution" to the South China Sea dispute. President Barack Obama has spoken of a "strong commitment to a regional order where international rules and norms —and the rights of all nations, large and small — are upheld," but Chinese disobedience of the tribunal ruling would disregard those principles.

"This dispute will likely impact the U.S.-China bilateral relationship," Keith said, echoing most other experts interviewed by CNBC.

What Beijing is saying

Although the Chinese government has formally abstained from the arbitration process, its opinion is not a secret.

In particularly nationalistic media outlets, such as the Communist Party-controlled Global Times, the issue has been presented as cut and dry: This is China's property, everyone else is getting in the way, and the military may have to get involved.

"The South China Sea dispute has been greatly complicated after heavy U.S. intervention. Now an international tribunal has also been included, posing more threat to the integrity of China's maritime and territorial sovereignty," the Times wrote in a recent editorial.

"China is a peace-loving country and deals with foreign relations with discretion, but it won't flinch if the U.S. and its small clique keep encroaching on its interests on its doorstep," the editorial continued. "China hopes disputes can be resolved by talks, but it must be prepared for any military confrontation."

Other articles that have been blasted across Chinese outlets in recent days paint a picture of a blameless China, which enjoys the support of most impartial observers since it is being bullied by its neighbors — who are in turn acting in the interest of a power-hungry U.S. that has divided a once-peaceful region in order to make the "next Caribbean."

In terms of actual legal arguments, China has regularly noted that UNCLOS arbitration is not allowed to determine sovereignty — although the Philippines worded its claims to specifically avoid that problem.

China exempted itself, before the tribunal hearing, from facing compulsory dispute resolution on matters of "sea boundary delimitations" — as UNCLOS itself allows. So, Beijing argues, any tribunal ruling on the nine-dash line is an overreach of its authority.

— CNBC's Seema Mody contributed to this report.