The Japanese subsidiary of US fastfood giant McDonald's may be about to ink an agreement with compatriot doughnut maker Krispy Kreme. Mark Kalinowski, an analyst with Salomon Smith Barney, is reported by Reuters as saying in a research note that the partnership would allow McDonald's to ramp up its operations in Japan by diversifying into the popular sweet treat. He reminded investors that the Japanese have already warmed to other American sweet snacks such as Cinnabon cinnamon rolls.