Russia's President Vladimir Putin said in remarks published on Wednesday that if US troops appear in Ukraine, Russia will treat them as interventionists, RIA state news agency reported.
Putin, in a wide-ranging interview with RIA and the Rossiya-1 state television, said also that if the United States conducts nuclear tests, Russia may do the same.
He also added that Russia is ready - from a military-technical point of view - for a nuclear war, but for now, not "everything is rushing to it."