russia
Russia is to the west of Alaska and Canada to the east
Russia
Russia and Alaska share a maritime border.
The country closest to the West-most point of the day is the USA. In the USA, Alaska protrudes most to the West. Attu westernmost island in the Near Islands group of the Aleutian Islands of Alaska. So you could say that the day ends in Attu, Alaska, USA.
Russia, Korea and Japan are all just west of Alaska.
west
West of the contiguous states is only the Pacific Ocean. West of Alaska, across the Bering Strait (and the International Date Line) is Russia, from which the United States purchased Alaska.
Alaska has a shared maritime border with Russia.
Alaska
The answer is Canada but its not Russia cause then it would be the west
located north of the Northwest Territories, the Yukon, and Alaska and west of Canada's Arctic islands. Mostly Alaska, I believe. mer de Beaufort