Reading time 1 minMaking Ukrainians freeze in winter wasn't enough. A Russian strike hit a moving train on Tuesday in the northeastern Kharkiv region, killing six people. As the casualty toll on both sides approaches two million according to an independent study, we weigh the grinding effect of nearly four years of all-out war. Read moreAt least six killed in Russian drone attack on passenger trainAnd what it will take to end it? NATO Secretary General Mark Rutte is telling allies to "keep on dreaming" if they think they can go it alone without a US-led NATO.