A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

The 66-year-old wrote in a tweet Tuesday that he is experiencing mild symptoms and is "following the experts' advice" by isolating himself until he's healthy.

Kremlin-backed news outlets RT and Sputnik have become flashpoints for social media companies that are under pressure to curb the spread of Russian propaganda and disinformation.

Activision Blizzard is behind huge games such as Call of Duty, World of Warcraft, and Candy Crush. But the company has faced reports of a workplace culture rife with sexual harassment.

According to Microsoft, the group is targeting technology companies that resell and provide cloud services and has been using phishing and password spray to gain entry to targeted networks.

Microsoft users will be able to access their accounts using an app or a code sent to their phone or email. Company officials say it will make logging on both easier and safer.

The Defense Department canceled its $10 billion cloud contract called JEDI, planning instead to hire multiple vendors. Amazon sued after its loss to Microsoft, seeking to depose Donald Trump.

Microsoft is officially pulling the plug on perhaps the most-hated web browser that once dominated the competition. Internet Explorer will be put to rest in the summer of 2022.

All three companies say they intend to abide by local health protocols and safety guidelines as limited numbers of employees will be allowed to return to headquarters.

Microsoft previously said it was among thousands of companies that discovered malware on its systems. But now it is revealing the attack allowed hackers to access its closely guarded source code.

Most of the Microsoft customers hit by the hack were in the U.S., but the rest were elsewhere in North America and in Europe and the Middle East.

The Amazon CEO and four other billionaires are part of the world's most exclusive club in the midst of the pandemic: those whose fortunes exceed $100 billion.

The deal is set to be one of the largest ever acquisitions in the video game industry. Once the deal is finalized, Microsoft will own popular franchises such as Wolfenstein, Quake, and DOOM.

Walmart cited a potential boost from TikTok to its online presence, including the giant retailer's efforts to grow online advertising and a marketplace for third-party sellers.

In its first public acknowledgement of a deal that could be worth in the billions of dollars, Microsoft said it is continuing talks with TikTok about a potential takeover of the hugely popular app.