Russian President Vladimir Putin appointed a new cabinet, but kept key ministers following proposals last week for sweeping constitutional changes that could see him retaining political power after his term ends. The plans amounted to a broad overhaul of the balance of power in Russia and were widely seen as a move by Mr. Putin, who was re-elected to his fourth presidential term in 2018, to consolidate his control. The proposals preceded the resignation of the previous government led by Dmitry Medvedev, his loyal lieutenant. …