– With a historic visit to the Alaska Arctic, President Obama aimed a spotlight Wednesday on the plight of residents in rural Alaska, where Alaska Natives and others toil under rough-and-tumble conditions that most Americans would be hard-pressed to imagine.

Closing out his three-day tour of Alaska, Obama first dropped in on the fishing village of Dillingham in western Alaska to inspect one of the biggest sockeye salmon runs in the world and underscore the need to "protect this incredible natural resource, not just for the people whose livelihood depends on it, but for the entire country."

From there, he traveled north of the Arctic Circle to the town of Kotzebue, a regional hub with a population of barely more than 3,000.

Obama's trip, the first by a sitting president to the Arctic, put on rare display the ways of life and daily challenges in Alaska's more than 200 far-flung rural villages. Outside of Kotzebue, 1 in 5 homes in the Alaska Arctic doesn't have a proper kitchen, according to the U.S. Census Bureau. Even more lack plumbing. Instead, many use "honey buckets" — five-gallon drums that serve as makeshift toilets.

The president's goal was to showcase the havoc that he said human-influenced climate change is wreaking on Alaska's delicate landscape: entire rural villages sinking into the ground as permafrost thaws, protective sea ice melts and temperatures climb.

"I've been trying to make the rest of the country more aware of the changing climate, but you're already living it," Obama said in a speech.

Alaska Natives have joined the president in sounding the alarm on climate change. Yet the obstacles they confront daily extend far deeper, raising questions about whether the federal government has done enough to help some of the country's most destitute citizens.

Theirs is a life of subsistence hunting for whales, walruses and seals, a proud tradition of dependence on the land that poses immense challenges.

"The vast majority of Americans have no idea there are dozens of communities in Alaska that live like this," Sen. Dan Sullivan, R-Alaska, said in an interview. "It's unacceptable, and we need to do more to fix it."

Chinese Navy ships nearby

Even as Obama's travels brought him near the Bering Sea, U.S. officials reported the presence of five Chinese Navy ships in the sea — the first time they have been observed there.

White House press secretary Josh Earnest said U.S. officials don't view the Chinese vessels to be a threat but he added that the reason for their presence "is still unclear."

The ships were participating in a military exercise with Russia in previous days and then broke off to head into the Bering Sea, officials said.

During his visit to Kanakanak Beach in Dillingham, Obama inspected all aspects of the fishing operation and pronounced a sample of salmon jerky to be "outstanding." He took it in stride when he noticed salmon spawning on his shoes, and went on to deliver a serious environmental message.

"Hopefully by us coming here, we're highlighting the need for us to keep this pristine and make sure that this is there for the children and grandchildren, great-grandchildren of all these wonderful fishermen," Obama said.

With no roads to their villages, residents in rural Alaska are dependent on boats, snowmobiles and bush planes — weather permitting — to ferry them to rare doctor visits or other business. Among Alaska Natives, cancer is the leading killer, with rates 16 percent higher than for white men and women in the U.S., according to the Centers for Disease Control and Prevention.

Temperatures rising twice as fast

At the same time, temperatures in the Arctic are rising twice as fast as anywhere else on earth, the National Oceanic and Atmospheric Administration has said, bringing with it profound changes to Alaska's cherished landscape. Amid poverty and few resources, many rural villages have had their foundations literally pulled out from under them as the planet warms.

Permafrost, the layer of frozen ice under the surface, is thawing and causing homes, pipes and roads to sink as the soil quickly erodes. Some 100,000 Alaskans live in areas vulnerable to melting permafrost, the Environmental Protection Agency estimates.

And in coastal Alaska, sea ice that once offered critical protection is melting, exposing coastlines, causing more extreme ocean storm surges and risking mass emergency evacuations.

It's bad enough that the 400 or so residents of Kivalina, an Arctic town on a skinny barrier island along the Chukchi Sea, have decided they have no choice but to pick up and move.

Kivalina is one of about a dozen villages that have voted to relocate to more stable terrain inland despite the hurdles it presents in retaining traditions such as hunting.

Alaska officials said that well over $2 billion in federal and state funds has been spent over the past 50 years to bring indoor plumbing to rural Alaska, but the challenge is finding money to build water and sewer systems in nearly three dozen villages that still lack them.