Following Russia’s warning that it was placing its nuclear forces on notice amid its conflict in Ukraine, which threatens to lure NATO into direct confrontation with Russia, the UN secretary-general warned nuclear war is “again within the range of possibility.” ...

Questions were raised about Ukraine’s ability to stage a fight as Russia’s forces rushed across the border in the early hours of Thursday morning. President Vladimir Putin commands the world’s fifth-largest active military, which exceeds the force now deployed in ...