Dec 29 (Reuters) - The following are the top stories in the Wall Street Journal. Reuters has not verified these stories and does not vouch for their accuracy.

- The United States will impose mandatory COVID-19 tests on travelers from China, U.S. health officials said on Wednesday, joining India, Italy, Japan and Taiwan in taking new measures after Beijing's decision to lift stringent zero-COVID policies.

- U.S. oil major Exxon Mobil Corp is suing the European Union in a bid to force it to scrap the bloc's new windfall tax on oil groups, arguing Brussels exceeded its legal authority by imposing the levy.

- Twitter Inc suffered a major outage on Wednesday, leaving tens of thousands of users globally unable to access the popular social media platform or use its key features.

- Lockheed Martin Corp's Sikorsky unit on Wednesday sought a review of the U.S. Army's decision to award a contract for its next-generation helicopter to Textron Inc's Bell unit.

- National Guard troops trudged door-to-door on Wednesday looking for winter storm victims who may be unaccounted for in parts of Buffalo hit by prolonged power outages, after a deadly Christmas blizzard that buried New York's second-largest city in blinding snow.

- The House select committee investigating the Jan. 6 Capitol riot withdrew a subpoena it issued in October to Donald Trump as the investigation has wrapped up and Republicans are set to take control of the chamber in January. (Compiled by Bengaluru newsroom)