Russia said its forces took complete control Saturday of a city in eastern Ukraine that was the focus of intense combat for months, a development that Moscow could use to boost morale as the second anniversary of its full-scale invasion of Ukraine approaches with the war largely at a stalemate. The Russian Defence Ministry’s announcement came the same day Ukraine’s military chief said he was withdrawing troops from the city of Avdiivka, where the outnumbered defenders had battled a Russian assault for four months. Russian Defence Minister Sergei Shoigu told the Kremlin that Russian forces were…