Ukrainian forces have reconquered over several thousand square kilometers of territory over the past week or so — more than all the territory Russia had added to its occupation in the six months since the start of the war.

The Ukrainian flag is suddenly flying again over numerous towns and villages, and the offensives in both the northeast and the south are pushing the Russians back. Abandoned Russian tanks and trucks are littering the roads. Is this a pivotal moment in the war? What is Vladimir Putin’s next move?

At a tactical level, the results on the battlefield are important but not definitive. While the Ukrainians have moved swiftly to bloody Russia’s nose, the Russians can simply fall back into defensive positions, consolidate their forces and defend their gains in Donbas and the vital land bridge to Crimea that runs through Mariupol. As the Russians shift from offense to defense, their military position will get stronger — in military parlance, "defense is to offense as three is to one.”