The distance between Russia and the United Kingdom varies depending on the exact points measured, but the direct flight distance (great-circle) from Moscow to London is about 2,500 kilometers (roughly 1,550 miles). If you measure from more distant points in Russia (e.g., far eastern Russia) to the UK, the distance can be greater, approaching around 5,600 kilometers (3,500 miles) in the far west of the UK versus the far east of Russia. For exact figures, specify the exact start and end cities (e.g., Moscow to London, or Vladivostok to Glasgow) and whether you want air-distance or travel-distance. If you’d like, provide a pair of cities or precise locations, and I’ll give you the exact distance and the approximate travel time by air.