We’re covering the world preparing for possible war in Ukraine and China’s inward focus under Xi Jinping.

       Ukraine in a state of emergency In its most dire assessment yet, the Pentagon said on Wednesday that 80 percent of the 190,000 Russian troops and separatist forces in or near Ukraine are in combat-ready positions, and that a full-scale military assault is most likely imminent. Here are the latest updates.

       Ukrainians braced for all-out war as officials prepared to declare a 30-day state of emergency and mobilized military reservists. Government websites, including that of the Foreign Ministry, were brought down by a hack.

       Australia and Japan on Wednesday joined the U.S., European allies and other nations in announcing sanctions on Russia. Among those who face financial and travel penalties are Russia’s defense minister, the chief of staff to President Vladimir Putin and other members of Putin’s inner circle.

       Officials said more sanctions were to come. The Biden administration is preparing a ban on American technology exports to Russia if it escalates the conflict.

       Response: Putin remained defiant, saying in a video message that “the interests of Russia and the security of our citizens are unconditional for us.” Russia’s ambassador to Washington said that Russia would not “revise its foreign policy under a threat of restrictions.”

       What’s next: The E.U. is preparing for large numbers of displaced people from Ukraine if a full-on conflict breaks out. Leaders will hold an emergency summit in Brussels on Thursday.

       Newsletter: Sign up for a nightly update on the Ukraine crisis.

       Sanofi-GSK vaccine shows promise Two doses of a new Covid vaccine achieved 100 percent efficacy against severe disease and hospitalizations, and it could be an effective booster, its manufacturers said on Wednesday.

       The vaccine, made by the European companies Sanofi and GSK, is a conventional inoculation and is not based on mRNA. It received billions of dollars for development from Operation Warp Speed, the Trump administration’s vaccine accelerator.

       The shot showed 58 percent efficacy against symptomatic disease in its Phase 3 clinical trial. The number is lower than results for mRNA vaccines from Pfizer and Moderna in initial trials, but it is “in line with expected vaccine effectiveness in today’s environment dominated by variants of concern,” Sanofi and GSK said in a statement.

       Details: The best target for Covid vaccines is a protein called spike. While the mRNA vaccines contain the genetic instructions for making the protein, the Sanofi-GSK vaccine uses a slightly modified version of the protein itself to stimulate an immune response.

       Here are the latest updates and maps of the pandemic.

       In other developments:

       Italy will end its Covid state of emergency on March 31.

       The E.U. wants to relax rules for vaccinated travelers from abroad.

       South Korea on Wednesday approved Pfizer’s vaccine for 5- to 11-year-olds, as cases soar.

       Xi’s China turns inward Modern China was built on global connections: sending young people, companies and future leaders to soak up the outside world.

       Now, emboldened by its transformation — and its most dominant leader in decades, Xi Jinping — the country is shunning artistic and intellectual ideas from abroad.

       Officials are restricting English education and foreign teachers. Regulators have punished companies for raising money overseas. Xi has pushed traditional Chinese literature and art, and warned artists against imitating Hollywood. Under new rules, TV credits even have to specify whether actors or crew members have foreign citizenship.

       The number of foreigners living in Beijing and Shanghai has dropped by nearly one-third in the past decade. The government, citing the coronavirus pandemic, is no longer freely issuing most passports, the physical symbol of an interconnected world.

       Quotable: “There’s no more integration and exchange between different cultures,” said Zhang Jincan, the owner of Dusk Dawn Club, a live-music venue in Beijing.

       THE LATEST NEWS Asia Pacific

       Hundreds of protesters opposed to New Zealand’s Covid vaccine rules are camping out for the third week in Wellington, and in recent days the demonstration has grown more violent.

       South Korea on Wednesday tested a missile interceptor, Reuters reported.

       The Beijing Olympics had the smallest prime-time audience on record for any Winter Games.

       Around the World

       U.N. climate scientists are warning of a “global wildfire crisis.”

       U.S. Soccer and members of the U.S. women’s national team agreed to a $24 million settlement to end a six-year equal pay lawsuit.

       The U.S. will end a contentious Trump-era effort to fight Chinese national security threats that critics said unfairly targeted Asian professors.

       A trial began for one of the officers who fired his weapon in the nighttime police raid that killed Breonna Taylor in Kentucky in 2020.

       Scientists may have pinpointed the season when an asteroid collided with Earth and killed the dinosaurs: springtime, when animals are less likely to be hibernating.

       A Morning Read

       The swamps of the Congo Basin are home to one of the planet’s greatest natural resources, peatlands that store an immense amount of carbon if they are left untouched. Now, the guardians of the world’s biggest network of tropical peatlands are asking why they aren’t being paid more to keep it intact.

       ARTS AND IDEAS South Korea’s elections Koreans will vote for the next president on March 9, in an election that has been described as one of the most contentious in decades. I caught up with Choe Sang-Hun, The Times’s Seoul bureau chief, to talk about what voters want and how they view corruption allegations against the main candidates: Lee Jae-myung of the ruling, progressive Democratic Party and Yoon Suk-yeol of the opposition, conservative People Power Party.

       This election is being described as “the election of the unfavorables.” What is the mood among voters?

       Yes, it is called a contest between the unlikable because the two main candidates and their families have been embroiled in a series of scandals. It’s also because South Korean politics is more polarized than before and there is intense negative campaigning.

       There are corruption allegations against both front-runners, from shamans to controversial development deals. How do Koreans feel about those issues?

       In general, people seem embarrassed and distraught by the endless flow of allegations. But it also depends on whom you talk to. The country is deeply divided along the partisan line.

       What are some of the major worries for South Koreans that the candidates are focusing (or not focusing enough) on?

       Housing prices and how to make homes more affordable. How to protect small private business owners who have been hit the hardest during the pandemic. The widening income gap. How to eradicate corruption.

       Polling seems to show that neither Lee nor Yoon is widely beloved. How did they end up being the front-runners?

       South Korean politics has always been led by, and divided between, the two main political parties that represent the progressives and conservatives, although the parties have changed their names frequently. Lee has been a popular mayor and provincial governor and bills himself as a leader who can deliver results. Yoon had been a star prosecutor under the government of President Moon Jae-in until the two fell apart.

       PLAY, WATCH, EAT What to Cook

       These rice noodles with egg drop gravy are a vegetarian riff on wat tan hor.

       What to Listen To

       These six true-crime podcasts feature stories about abusers and romance con artists.

       What to Read

       Quan Barry’s dazzling new novel, “When I’m Gone, Look for Me in the East,” centers on themes of faith, history, language and yearning.

       Now Time to Play

       Here’s the Mini Crossword, and a clue: Chief god on Mount Olympus (four letters).

       Play today’s Wordle. (If you’re worried about your stats streak, play in the browser you’ve been using.)

       And here’s the Spelling Bee.

       You can find all our puzzles here.

       That’s it for today’s briefing. Tell us what you think about this newsletter in this short survey. Thank you! — Melina

       P.S. David Gelles will join the Climate desk to cover the intersection of business and climate policy.

       The latest episode of “The Daily” is about Vladimir Putin’s logic for invading Ukraine.

       You can reach Melina and the team at briefing@nytimes.com.