Sir, – There are several possible causes of the Russo-Ukrainian war: 1) the expansion of NATO, which is the sole reason according to Professor Mearsheimer and accepted by Cdre Jermy (110/4, p. 482); 2) the fear felt by the increasingly autocratic Vladimir Putin of having a democratic Ukraine on Russia’s southern border, the view of former US Ambassador to Russia, Michael McFaul; 3) Russian imperialism, which sees a risk to Crimea, particularly Sevastopol, without a land bridge from Russian territory across the north of the Azov Sea; 4) The “Nazification and militarisation of Ukraine, whose rul…