Two articles published this week give a stark assessment of Ukraine’s prospects in its war with Russia. One – by the commander in chief of the Ukrainian military – admits the battlefield has reached a stalemate and a long attritional war benefiting Moscow beckons. The other portrays Ukrainian President Volodymyr Zelensky as exhausted by the constant effort to cajole and persuade allies to keep the faith. Ukraine’s military chief, Gen. Valery Zaluzhny, says in a long essay and interview with the Economist that “just like in the First World War we have reached the level of technology that puts us...