The fledgling firm, run by the president’s oldest son and his partner Omeed Malik, has made investments in A.I. and defense technology that have tripled in value in just months.

As threats from Moscow rise and support from Washington dwindles, the German military is reinventing how it researches, funds and wields 21st-century arms.

Sanae Takaichi has said she gets just “zero to three hours” of sleep a night, prompting a debate in the country over work-life balance.