Ukraine war: Russian spy chief blames West for nuclear tensionWestern leaders have expressed concern about the scale of nuclear sabre-rattling over Ukraine by senior Russian officials, including President Putin, especially after February's invasion."We are, of course, very concerned about Western rhetoric about the possibility of using nuclear weapons," Sergei Naryshkin responded.They rejected what they called "Russia's transparently false allegations" against Kyiv, adding: "The world would see through any attempt to use this allegation as a pretext for escalation.It is a sobering experience - an exhibition that transports you back to a time when the world was on the edge of nuclear Armageddon.Despite major setbacks on the battlefield, President Putin still seems determined to secure some kind of victory, both over Ukraine and against the West."