When Russian tanks crossed the Ukrainian border in February 2022, many believed it was yet another regional conflict with European dimensions.
Four years later, it is now clear that the war in Ukraine has not only changed the borders of Europe or West-Russia relations. It changed the very way we perceive war, deterrence, defense, and power in the 21st century.
The first major shift concerns drones. For decades, military planning relied on the superiority of air power, tanks, and large weapon systems.
In Ukraine, however, inexpensive unmanned aerial vehicles destroyed equipment worth millions. For the first time in history, technology has given relatively inexpensive means the ability to threaten systems that until yesterday were considered virtually invulnerable.
The battlefield has become “transparent,” as constant aerial surveillance makes it extremely difficult to conceal forces and movements.
At the same time, another myth has been debunked: that of the omnipotence of tanks. Tanks are not disappearing from the battlefield, but they can no longer operate without comprehensive protection against drones, electronic warfare, air defense, and active self-defense systems. The image of destroyed tanks on Ukrainian and Russian battlefields will be taught for decades in military academies.
At the same time, the war has brought back into the spotlight something many considered obsolete: attrition warfare! Trenches, minefields, fortified defensive lines, and months-long battles over a few kilometers of territory were more reminiscent of World War I than the swift operations most analysts had predicted.
Technology proved revolutionary, but it did not eliminate either geography or the need to hold territory.
Even more striking was the return of the defense industry to the center of strategy.
The enormous demand for ammunition, missiles, drones, and spare parts revealed that wars are won not only by armies but also by factories.
The West realized that the post-Cold War logic of limited stockpiles and dependence on global supply chains is insufficient for a large-scale conflict.
Thus, the defense industry has reemerged as a critical pillar of national power.
These lessons are not an isolated case. The recent escalation in the Middle East confirms the same trend: the dominance of cheap but effective strike capabilities and the growing need for multi-layered air defense.
As seen in the recent confrontations between Israel and Iran, the combination of drones, missiles, and air defense saturation capabilities creates new challenges even for the most advanced defense systems.
The “transparency” of the battlefield, which we observed in Eastern Europe, now translates into a constant threat to critical infrastructure, military installations, and energy networks.
For countries like Greece, located in a region of growing geopolitical instability, this development makes multi-layered air defense and anti-drone systems not a luxury, but a strategic necessity.
The war has also changed the geopolitical landscape of the world. NATO has not only not been weakened but has been strengthened, with Finland and Sweden abandoning decades of neutrality.
Europe was forced to rearm out of fear that the U.S. would abandon it to turn its attention toward China. Nevertheless, despite the problems caused by Trump’s policies, the US remains the primary guarantor of European security.
At the same time, energy, rare earths, communications networks, and supply chains have emerged as fields of contention just as significant as traditional weapons.
For Greece, the lessons are clear… The era when military power was measured solely by the number of aircraft, ships, and tanks is over. New deterrence requires drones, anti-drone systems, electronic warfare, artificial intelligence, cyber defense, and a strong domestic defense industry. It also requires infrastructure resilience, energy security, and strategic alliances.
The war in Ukraine is not merely a conflict between Russia and Ukraine. It is the first major testing ground for 21st-century warfare.
And the states that continue to invest exclusively in the certainties of yesterday may discover far too late that the war of tomorrow has already begun.
