The first confrontation between the US and Chinese navies concluded on Tuesday, when theChinese returned an underwater oceanographic dronecaptured in international waters outside of the Philippines.
"The incident was inconsistent with both international law and standards of professionalism for conduct between navies at sea," said Peter Cook, a Defense Department spokesman.
And President-elect Donald Trump tweeted of the incident, "Let them keep it."
The drone, composed of about $150,000 in off-the-shelf technology, ranks low on the list of US-China military confrontations — as past confrontations have involved air crews being detained and planes grounded — but it marks an important shift in what is quickly becoming one of the most militarized and fraught regions on the planet.
"It’s a very big deal because it is highly unusual for a Chinese navy ship to confront US Navy ship, even if an oceanographic vessel," said Bonnie Glaser, an expert on Chinese foreign and security policy at the Center for Strategic and International Studies.
While the confrontation consisted of a Chinese navy ship plucking the drone out of the sea, the drone belonged to a US Navy ship not far off. This action set a dangerous precedent sure to make US allies doubtful of American commitment to the region.
Glaser pointed to China's "willingness to just blatantly put a boat in the water and seize the drone," which she described as "an act demonstrating that they're going to do whatever is necessary to protect their interests in the South China Sea."
China has come a long way in the South China Sea. A few decades ago, China had a small, limited navy incapable of projecting power across a large swath of sea and islands.
But now, as China has become enriched by trade and investments, itsnavy has grown impressively. For years, China has been building artificial islands in the South China Sea and outfitting them with radar outposts,military-grade runways, and air defenses — everything Beijing would need to lock down the region and shoot down any planes that challenge its claims.
By the time the International Court of Arbitration at The Hague declaredChina's nine-dash line claims in the South China Sea unlawful and unenforceable, it was too late. China has already established "facts in the water" that give it an unparalleled military edge in a shipping corridor that sees $5 trillion annually, and its neighbors have noticed.
The seizure of the drone was "pretty consequential" in that it showed that "China is willing to stand up to the US and the US Navy," said Glaser.
"Allies and observers will find it hard not to conclude this represents another diminishment of American authority in the region," Douglas Paal, the vice president for studies at the Carnegie Endowment for International Peace, told The New York Times.
Glaser also spoke of "growing anxiety in the region."
"Not only in our allies in Japan and South Korea, but also other places like Vietnam and Singapore believe very much that US military presence is necessary to counterbalance Chinese military assertiveness," Glaser said.
In response to the incident, China suffered no visible consequences despite its clear defiance of international law.
Glaser suggested that oceanographic US Navy ships should now travel with a destroyer as an escort, but Jeffrey Lewis, Arms Control Wonk's founding publisher, said that the region is already a powder keg.
Lewis pointed to China's recent flights of H-6K bombers in the South China Sea as evidence of the "security environment deteriorating."
Despite being classified as non-nuclear-capable by the Department of Defense, these bombers were reported as being nuclear-capable bombersby several outlets. This speaks to a deeper problem with how nations signal military strengths and intentions to each other, Lewis said.
When China flies these bombers, mistakes can be made. If China puts its conventional missile forces on alert, it's difficult for the US to tell if the weapons are nuclear-capable. These ambiguities worry Lewis, as they could hypothetically lead to nuclear war for errant reasons.
Overall, according to Lewis, the Pacific is far less stable than it was just weeks ago before Trump accepted the call from Taiwan. Meanwhile, there has been "no progress toward underlying territory disputes" that fuel tensions in the region, he said.
With Trump, the US now has a president who will call China on its aggressive behavior in the South China Sea — he described it as a "massive military complex" in a tweet after taking the call from Taiwan's president, Tsai Ing-Wen.
"Trump appears to be keeping China off balance, criticizing North Korea, the South China Sea, and China on trade," said Glaser. "The Chinese are really quite concerned about the lack of predictability."
But the US's response to China remains to be seen. So far, the Obama administration has not moved to rebuke China over the drone, and the world has noticed. Adm. Harry Harris said the US was "ready to confront" China, but has not commented on how the US would confront it.
Meanwhile, experts, observers, and the Chinese have to wait and see how the Trump administration will respond.