Russia said on Wednesday that its forces were advancing north inside the Ukrainian city of Pokrovsk and clearing out Kyiv’s troops in a drive to take full control of what has been an important transport and logistics hub for the Ukrainian army. Ukraine has acknowledged its troops face a difficult position in the strategic eastern city, which Russia has been trying to capture for more than a year, but denies they are surrounded and says reinforcements are on their way. Russia sees the city as the...