There is "no guarantee" that Ukraine will win the war with the help of Western weapons.

With the hope of replicating the success of its counterattacks last September, Ukraine has been preparing to launch a spring counteroffensive to recapture territory seized by Russians. Ukrainian forces, despite receiving Western weapons, such as battle tanks, will need to alter their strategy, says historian and retired army officer Michel Goya, if they are to make any progress.

Armoured vehicles from the United States, the United Ki....