BERLIN/TOKYO—Deutsche Telekom has struck a share-swap deal with Softbank Group to increase its stake in U.S. unit T-Mobile and sold its Dutch unit in a major restructuring that strengthens the German group’s transatlantic focus. As a result of the two deals announced on Tuesday, Deutsche Telekom will raise its stake in T-Mobile US by 5.3 percent to 48.4 percent, bringing CEO Tim Hoettges closer to his goal of securing direct control over the $170 billion U.S. telecoms operator. Softbank will in return receive cash and a 4.5 percent stake in Deutsche Telekom, establishing a direct shareholding relationship after the Japanese group sold its U.S. Sprint unit to T-Mobile in a deal that closed in early 2020. The latest transactions seek to lock down that deal by bringing Deutsche Telekom within touching distance of majority ownership over T-Mobile US—which accounts for three-fifths of group sales and is its most profitable unit. …