Stocks of Yum Brands Inc. YUM are down 2.4% before the opening bell after the company reported that its first-quarter profits fell short. Yum Brands reported that its first-quarter profits dropped from $399m, or $1.36 per share, to $300m, or just $1.05, compared with the $1.36 per share it earned in the previous quarter. FactSet estimates show that adjusted earnings of $1.06 per share fell short of the $1.13 estimate. The revenue increased from $1.55 to $1.65 billion and beat analyst expectations of $1.62. Yum Brands announced that it had completed its exit from Russia as of April 17. Costs for the latest quarter were…