Your morning briefing, the business news you need in just 15 minutes.

On today's podcast:
(1) As the best hedge fund strategy of 2023 becomes a magnet for mainstream investors, the risk models it relies on are getting a lot tougher to crack.

(2) Warren Buffett's Berkshire Hathaway says its cash pile scaled a new record as the billionaire investor decried a lack of meaningful deals that would give the firm a shot at "eye-popping performance."

(3) Ukrainian President Volodymyr Zelenskiy said his country has lost 31,000 soldiers since Russia's full-scale invasion started two years ago as he stressed that a decision from the US Congress on $60 billion in aid was needed within a month.

(4) A former deputy chairman in Rishi Sunak's ruling Conservative party has been suspended after growing pressure from within the party over his claim that London Mayor Sadiq Khan is controlled by "Islamists."

(5) Global trade ministers are gathering in Abu Dhabi for the World Trade Organization's summit, amid a tide of trade protection and questions over the WTO's relevance.