Still new to these board and just discovered this brilliant section. I've been trying to remember this book for years even running through whole sci fi sections to find it but to no avail. I read it about ten years ago while backpacking. Pick it up of the "free books" shelf in a hostel in Australia but it looked relatively new so maybe released about that time (1999/2000).

It involved an American that became a spy for the Soviets during the cold war. He was involved an experiment that gave him a ship that let him go back in time to change history for the benefit of the Soviets. Instead he uses this time travel to help himself correct the mistakes of his own life. I think that was the gist of it anyway.