(KABUL, Afghanistan) — United States troops have taken control of the airport in Kabul, Afghanistan as chaos continues after Afghanistan’s president fled the country over the weekend and the Taliban seized control of the presidential palace, all but ending America’s 20-year campaign as it began: under Taliban rule.

U.S. troops have established large barriers and roadblocks on the streets near the airport in an effort to both slow and control the fleeing population.

White House National Security Adviser Jake Sullivan stood by the administration’s decision to withdraw troops by Aug. 31 on ABC’s Good Morning America Monday and placed blame for the speed of the Taliban takeover on the Afghan army for its decision “not to step up and fight for their country.”

“What the president was not prepared to do was enter a third decade of conflict, flowing in thousands of more troops, which was his only other choice, to fight in the middle of a civil war that the Afghan army wouldn’t fight for itself,” Sullivan said. “He would not do that to America’s men and women or their families, and that is why he made the decision to withdraw U.S. forces from Afghanistan this year.”

As with Pentagon officials, Sullivan would not say that the takeover took the administration by surprise but did acknowledge it “certainly unfolded at an unexpected speed.” Presented with the fact that thousands of allies appear stranded in the country, Sullivan said the U.S. had planned for a “wide range of contingencies,” though he didn’t offer more specifics on timing or numbers of people that will be moved.

“We believe that we can effectuate an ongoing evacuation of American citizens, of Afghans who worked for us, including interpreters and translators and others vulnerable Afghans at risk. We’re working to do that by securing the airport today and in the days ahead by taking people out one flight at a time, flight after flight,” Sullivan said.

Sullivan insisted Afghanistan presented the U.S. with an opportunity to prove “that we can fight terrorism effectively without having a large military footprint on the ground.”

He also said the American people can expect to hear from the president “soon” as President Joe Biden faces criticism from lawmakers on both sides of the aisle and the public for how the withdrawal has played out.

The increase of service members in Kabul follows Gen. Frank McKenzie, the commander of U.S. Central Command, meeting with representatives of the Taliban earlier Sunday in Doha, Qatar, to inform them not to interfere with the U.S. mission at the airport, according to a U.S. official.

As the Taliban advanced last week, the U.S. State Department announced it was reducing its staff levels at the U.S. Embassy in Kabul and the Pentagon began sending in U.S. troops — now up to 6,000 — to help facilitate departures of Americans and Afghan allies.

The world reacts

An emergency session of the United Nations will be held Monday, and leaders around the globe have been issuing responses to the Taliban takeover of Afghanistan.

British Defense Secretary Ben Wallace was speaking about the race against time to evacuate Brits and Afghans who helped the military when he became overcome with emotion after saying that some people who served the U.K. will not come back.

When asked in an interview with British radio station LBC why he was taking it so personally, he said, “Because I’m a soldier. It’s sad, and the West has done what it’s done, and we have to do our very best to get people out and stand by our obligations.”

Russia’s top envoy on Afghanistan has said Moscow will not rush to recognize the Taliban as the country’s new government.

But the envoy, Zamir Kabulov who oversees Russia’s Afghan policy, said in a radio interview with Echo of Moscow the Taliban had learned its lesson from 20 years ago when the world moved against them as terrorists.

He said the Taliban had promised no Russians would be harmed and that the group’s fighters have now taken Russia’s embassy under protection in Kabul. Russia has not evacuated its embassy so far, though it has pulled out some staff.

Meanwhile, official statements from China lay the groundwork for Beijing recognizing a Taliban government.

Spokesperson Hua Chunying noted that the Taliban said Sunday that the “war in Afghanistan is over” and that they will work to establish an inclusive government and ensure the safety of foreign missions in Afghanistan. Chunying said China expects these statements to be implemented in order to ensure a smooth transition and curb terrorist and criminal acts, so the Afghan people can avoid war and rebuild their country.

China has been wanting to expand their Belt and Road infrastructure initiative into Afghanistan but the U.S.-backed government had been reluctant to commit. China is connected to Afghanistan by a sliver of land called the Wakhan Corridor, which has historically been a well-traveled trade route. It connects to China’s Xinjiang region, and if it were opened, it would provide a better route from Kashgar, China, to Peshawar, Pakistan.

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(NEW YORK) — After a deadly 7.2-magnitude earthquake devastated Haiti Saturday morning, destroying hundreds of buildings and homes, the beleaguered country is in need of assistance as a new tropical storm threat approaches.

Haiti’s Civil Protection agency announced Sunday that the death toll is at least 1,297 with initial reports that indicate there are more than 700 collapsed buildings, including hospitals and schools, at least 3,778 homes destroyed and significant damage to infrastructure and roads. The country’s prime minister declared a monthlong state of emergency.

How people can help

Disaster response teams from World Central Kitchen, an international humanitarian organization, and Team Rubicon, a veteran-led charity group, arrived in Haiti with food, water and relief supplies early Monday.

Both nonprofit organizations originated from the front-line relief efforts from the 2010 earthquake in the same country. Now, 11 years later, Team Rubicon executive and military veteran Jake Wood explained what their services look like in action amid chaos and uncertainty.

“There is the literal fog of war that takes place in those moments,” Wood told ABC News. “As veterans being able to conduct that operational planning, identify those risks and mitigate them, work within those local populations was a huge benefit — to get out to otherwise denied areas.”

Americans can donate directly to Team Rubicon here and visit their site and social media channels for updates and information as the efforts continue.

There are already culinary students in Haiti hard at work making meals for first responders thanks to world renowned chef and hospitality executive José Andrés, who has traveled to Haiti over 20 times with the group, providing food in the wake of natural disasters.

Nate Mook, World Central Kitchen executive director, told ABC News that “Haiti is in need of a lot right now” but their focus “is providing hot food, fresh meals.”

Haitian communities in the United States have started to rally support for the struggling nation.

Yolette Williams of the Haitian American Alliance said that after the initial period of shock “you get into working mode” and think about “what are we going to do?”

In Brooklyn, New York Haitian Americans have held meetings to decide the best way to get crucial resources to loved ones.

Local organizations in Miami have also combined efforts to send medicine and nonperishables directly to first responders on the ground.

Marleine Bastien, executive director of the Family Action Network Movement, told ABC News “we want to do things differently” than how the response was handled 11 years ago.

“We don’t want a repeat of what happened in 2010, where a lot of international organizations collected millions and millions and the money never reached the impacted people,” she said.

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