Wow. Any evidence of this?
Iran didn't have any nuclear goals, and no, both Russian and American goals are both offensive and defensive.
Who told you this?
I'm not an expert in Shia Islam, but it doesn't seem more "death-worshipping" than Russian version of Orthodox Christianity or Chtonic cult of Mother-Wet Soil, American Evangelism and/or Satanism, or Indian Buddhism (in which Nirvana is the death in atheistic understanding) say nothing about certain cults in Talmudic tradition.
In the current Iranian government there are Persians, Armenians, Azerbaijani and other ethnic groups, they work with Sunni Hezbollah and North Korean Pagans. They seem to be tolerant and reasonable guys.
They can play deterrence game. If you don't kill them, they won't kill you.