A nuclear attack would most likely target one of 6 US cities. Simulated images show how a Hiroshima-like explosion would affect each.

President Putin has made veiled threats that he could deploy nuclear weapons as Russia struggles to make progress in invading Ukraine.

Insider has learned that nuclear weapons are not likely to be used in combat, a move that would put Russia at risk of alienating its allies and its own people. Experts haven't seen evidence of a strike.

World leaders are taking the threat of a nuclear war seriously.

The consequences of a nuclear weapon's impact can be modeled using an interactive tool.

A rough estimate of casualties and injuries is provided by the tool using updated Cold War models of nuclear explosions.

This simulation shows what a 15- kiloton blast would look like on six US cities.