Vladimir Putin has approved changes to Russia’s nuclear doctrine, setting out new conditions under which the country would consider using its arsenal. The doctrine now says an attack from a non-nuclear state,

U.S. stock futures fell, as did bond yields, following reports that Russian President Vladimir Putin approved a change to the country’s nuclear doctrine. The move would allow a Russian nuclear response to conventional weapon usage and comes after the U.

Safe-haven assets bounced sharply on Tuesday, after a warning from Russia over its updated nuclear doctrine that was aimed at making possible enemies aware of inevitable retaliation for an attack on the country or its allies.