The sheer intensity, scale and duration of the Russia-Ukraine war marks a significant Paradigm shift in the very nature of war-fighting in the current era. Conflict now closely resembles the titanic battles and carnages of the First World War or even the grinding battles of attrition that marked the closing stages of the Second World War. In the dynamic between offense and defence; between tank and anti-tank Weapons; between Aircraft and Air Defence Systems, we are seeing a new equilibrium that clearly favoursdefence over offense. Singular Artillery has once again become the critical war winning factor, just as it was in the two world wars. Additionally, over 3,600 Tactical Ballistic, Cruise and Hypersonic missiles have been fired by Russia alone in this war. The resultant scale of casualties and carnage have been simply unprecedented in our times. Most military analysts feel that we are witnessing a pivotal moment in military history—the re-ascendence of defence as the decisive form of war. The levels of battlefield transparency today are simply unprecedented. This makes surprise impossible to achieve. Sans surprise and given the very high levels of lethality of Precision Guided Munitions (PGMs), most attacks result in very heavy casualties in men & material and result in carnage & stalemates with little to show for the effort and resources expended. Given the scale of casualties, we will have to focus hard on Force—preservation, reconstitution of badly battered units and quick replacement of casualties in future wars. This is the most inopportune time to downsize or reduce numbers (as we in India are doing). The world over, defence budgets are rising very fast & armed forces are adding not just new weapons and equipment but also increasing the size of their armed forces. This is the new era of not just high-tech but high-tech and mass. Nations that want to win in such unrelenting wars will need to generate the mass that is required to prevail in such intense & long duration grinds of attrition. Wars will increasingly be a test of national will and stamina to stay the course. Both Russia and Ukraine are feverishly raising and training new formations even as they are locked in brutal combat. Downsizing a standing field force in such a dire scenario could well be an invitation to disaster. We are witnessing the return of the era of Von Clausewitz. Today the world is witnessing the sheer costs nations are willing to endure to attain their objectives and simply prevail in such hard fought slogs of attrition. Since 70 per cent of India’s high-tech military equipment are of Russian origin, we have a dire need to study and ingest the lessons of this campaign. Perhaps the lessons of the economic war and the information and cyber war domains are as vital as the lessons of kinetic war.