[contentcards url=”https://www.nytimes.com/2020/11/27/world/middleeast/mohsen-fakhrizadeh-iran-scientist-killed.html” target=”_blank”] By Farnaz Fassihi, Ronen Bergman, David E. Sanger and Eric Schmitt The scientist, Mohsen Fakhrizadeh, was described by U.S. and Israeli intelligence assessments as the force behind…