France has joined a growing list of European nations in banning Russian aircraft from its airspace.

"France is shutting its airspace to all Russian aircraft and airlines from this evening on," French transport minister Jean-Baptiste Djebbari said Sunday on Twitter. "To the Russian invasion of Ukraine, Europe responds with total unity."

The United Kingdom, Germany, Italy, Poland, Bulgaria and the Czech Republic are among the European countries prohibiting Russia from using their airspace. The Baltic states of Lithuania, Latvia and Estonia are also enforcing airspace closures, limiting the westbound routes available to Russia.

In response to earlier sanctions, Russia banned British airlines from crossing its airspace and landing at its airports.

Russia's willingness to hold talks after encountering serious resistance to its invasion is a "victory for Ukraine," Ukraine Foreign Minister Dmytro Kuleba said during a briefing Sunday.

"I think that the fact that Russia is ready to hold talks — without any preconditions, without any ultimatums, without any demands addressed to Ukraine — is already a victory for Ukraine," Kuleba said.

"After they suffered losses and realize that their plan doesn't go as it was actually planned and designed and the blitzkrieg failed, Russia started speaking with the language of ultimatums saying that they are ready to talk with Ukraine with preconditions that have to be met before talks begin," he said.

President Volodymyr Zelenskyy's office confirmed Sunday that a delegation has agreed to meet with Russian officials at the Ukrainian-Belarusian border, near the Pripyat River. Zelenskyy earlier said that his government would not attend negotiations in Belarus, a close ally of Moscow’s where thousands of Russian troops massed in the lead-up to the invasion last week.

Ukrainian officials said Sunday that their forces had taken back control of Kharkiv, Ukraine's second-largest city, after fighting pitched street battles with the Russian troops.

Two former U.S. Citizenship and Immigration Service officials are calling on the Biden administration to immediately grant protections to Ukrainians that would allow them to remain in the country without fear of deportation.

Emilio Gonzalez, who served as director of USCIS under former President George Bush, and León Rodríguez, who served as the director of USCIS under the Obama administration, told NBC News on Sunday that they have written a letter to President Joe Biden asking him to grant Temporary Protected Status to Ukrainians in the U.S., which they plan to send in the coming days.

"It's just something very pressing and something that I feel very strongly about," said Gonzalez, in a phone interview. "I did when I was the USCIS director, and I do now [feel] that some people through no fault of their own need protection and if they find themselves in the greatest country in the world at that point in their lives, we should extend that protection."

Under U.S. immigration laws, the secretary of the Homeland Security is authorized to offer TPS to immigrants living in the country if it is determined that their home countries are unable to safely accept deportees due to armed conflict, natural disasters, an epidemic or other "extraordinary" emergencies.

Asked whether the U.S. was considering extending TPS to Ukrainians, White House press secretary Jen Psaki said Thursday it would be a decision for the DHS to make. 

"TPS is always on the table when you have a major military crisis that causes the level of displacement that this one has caused," said Rodríguez in a phone interview, noting that the status had previously been granted for other nations, including Syria and Venezuela. "So there's nothing different really about Ukraine in my mind." 

"It is my sincere hope that people will be able to return to Ukraine soon, but right now, there's no question that it is not a place to which people can return safely," he added. 

Russia's space agency, Roscosmos, is halting all launches of its Soyuz rocket from Europe's spaceport in South America over sanctions imposed by the European Union.

"In response to EU sanctions against our enterprises, Roscosmos is suspending cooperation with European partners" on space launches from Europe's spaceport in French Guiana, Roscosmos chief Dmitry Rogozin said in a statement posted Saturday on Twitter, according to a translation.

The agency said it will also withdraw 87 personnel from the South American launch site who work for several Russian companies to support the launch of Soyuz rockets. "The issue of the departure of Russian employees is being worked out," Roscosmos said on Twitter.

Russian-built Soyuz rockets are used to launch satellites from French Guiana for Arianespace, a commercial launch provider based in France. Roscosmos' announcement will likely delay the launch of two Galileo navigation satellites from South America, while increasing tensions between Russia and its other space agency partners, including NASA and the European Space Agency.

Tens of thousands of people took to the streets in Berlin on Sunday to protest Russia's invasion of Ukraine as demonstrations erupted around the world in solidarity with the Ukrainian people.

An estimated 100,000 people were at the demonstration at the Brandenburg Gate in central Berlin, according to The Associated Press. 

In aerial photos, a seemingly endless mass of demonstrators could be seen surrounding the Brandenburg Gate and beyond, with many waving yellow and blue Ukrainian flags as some carried signs with slogans like "We stand with Ukraine" and "Stop Putin." 

Protests have taken over city streets around the world over the weekend, including across Europe and beyond. 

In photos, demonstrators could be seen gathering in London's Trafalgar Square on Sunday, waving flags and signs in solidarity with Ukrainians. Demonstrations could also be seen in Athens, Greece; Istanbul; Johannesburg; and other cities around the globe.

Doctors Without Borders, the humanitarian organization known for providing medical care in conflict zones, said Friday that it was suspending its work in Ukraine.

"Our teams in Belarus and Russia stand ready to provide humanitarian assistance if needed and we are looking to send teams to other neighbouring countries to be ready on stand-by, either for response in Ukraine or to provide humanitarian medical assistance to refugees seeking asylum abroad," the organization said in a news release.

As it suspends its HIV and health care programs in Ukraine, Doctors Without Borders said it will refocus its efforts on preparing emergency medical kits and adapting as the conflict unfolds.

U.S. Ambassador to the United Nations Linda Thomas-Greenfield said Sunday Russia can be isolated by the United Nations and will be called out by the U.S. and its allies for invading Ukraine in upcoming meetings.

"We can isolate them in the United Nations, We can isolate them in U.N. specialized agencies, they are feeling that isolation," said Thomas-Greenfield in an interview on NBC's "Meet the Press."

The U.N. Security Council will hold another meeting later Sunday, "in which we will make a decision to call for an emergency session of the General Assembly, which we plan to have on Monday," she said, adding that Russia "will be called out and their aggressions will be brought to the attention of the world."

"Then hopefully later in the week, we will have a vote possibly as early as Wednesday on a General Assembly resolution that the Russians cannot veto," Thomas-Greenfield added.

There’s no schedule, the border guards say, but all of the trains arriving at the Przemysl train station on Poland’s border with Ukraine are packed with hundreds of people trying to spot their relatives through the windows.    

Polish soldiers greet them as they dismount. Behind a fence some 10 feet away, anxious relatives look out to see if their loved ones are on board. 

Among them was Oksana, 40, who said she was waiting for her son Andri, 14.

“I think he’ll be safer here,” said Oksana, who did not wish to give her last name because she still had family in Ukraine and feared for their safety. 

Her wait ended when she got a text from her cousin Olana, 42. Spotting them in the crowd she ran over to them and they hugged and cried.