June 16, 1940 was also a Sunday. Germany attacked a year earlier. England and France sided with the fascists—indeed, all of Europe rose against the USSR. And Stalin has no allies. Unless… trying to interest distant overseas states?
But starting from 1937, there is access to 21st-century technologies; there is a small, but well-trained and excellently armed army. And there are also two people sent into that parallel world, where time flows almost four times faster. Two who can turn the course of history and change our world for the better.