UPDATE 1 — Russians vote in election that Putin sees as barometer of public support for his war in Ukraine
Vote will determine make-up of 450-seat State Duma United Russia is widely expected to retain dominance in tightly controlled political system Initial partial results are expected from 1800 GMT on Sunday (Recasts, adds voter quotes in paragraphs 7-9, details, colour, context) By Andrew Osborn MOSCOW, Sept 18 (Reuters)