The Ukraine crisis will force the NATO military alliance to rethink its strategy once again. Up to now, NATO has focused on being an army ready for deployment well outside of its member states' regions, such as in the extended conflict in Afghanistan. That approach was evident, in part, when it came to decisions on arms and supplies for European forces: fewer soldiers, fewer heavy combat units, and, instead, highly mobile units that could quickly be sent off to operations in far-off lands.

In the course of this restructuring process, Germany's armed forces, the Bundeswehr, reduced its artillery and tanks to a minimum and got rid of compulsory military service. In fact, the Bundeswehr now has just one-tenth of the number of tanks it had 25 years ago, when the Berlin Wall fell. In their place came an increased capacity for transportability and other logistical skills. Was that shift too hasty?

Suddenly, the specter of a Russian attack on NATO territory to the east has re-emerged - a scenario that had vanished from public discourse for years. Although defense against such a land attack within NATO allies' territory in Europe has always been viewed as being among the military alliance's actual core tasks, its political leadership had no longer taken the prospect seriously. With Russia, NATO had strived for as strong a partnership-style relationship as possible. We know now that that approach did not work.

Determent back in fashion

Russia's leaders have understood NATO as an anti-Russian alliance since the end of the Cold War. Now, NATO states must once again intensively examine the issue of defense against possible Russian attacks. Counting tanks and gun barrels was long seen as pass - something for those still trapped in the bygone Soviet era. However, NATO Secretary General Anders Fogh Rasmussen has made mention for weeks now of "deterring" Russian troops, while being able as a military alliance to defend its eastern member states, such as Poland, Romania and the Baltics, from potential attacks.

After Russia's Five-Day War with Georgia in 2008, those in NATO's planning circles considered such scenarios more carefully, but without any pressure from politicians. The US, NATO's most important partner, has also withdrawn massive amounts of weapons and troops from Europe. Meanwhile, Russia has reformed and newly equipped both its conventional as well as its atomic armed forces since 2008. The Russian army at the country's western border is home to a large and swift tank force that can transition from routine maneuvers into actual battle within days. That's according to the International Institute for Strategic Studies and NATO's Supreme Allied Commander in Europe Philip Breedlove, a US general.

Thinking through the unthinkable

NATO could do little to combat these troops at the moment. Combat brigades would first have to be brought in from the US and Western Europe - to Eastern Europe, Poland or Estonia. NATO's current strategy is to protect its eastern allies with rapid response troops that consists of continuously alternating units from the other member states. But the new reality on the ground will have to be taken into account during a NATO summit in September at the latest. Its defense plans must be quickly re-worked.

US President Barack Obama set the tone during his March visit to Brussels, saying Europeans need to spend more on defense. After all, Russia has raised its defense budget by nearly a third, while European countries have condensed their defense spending for years. After the costly wars in Iraq and Afghanistan, the US is also looking to save on defense. Nonetheless, the US military budget remains 10 times as large as Russia's.

European defense politicians were happy to be able to drastically reduce their spending during the financial crisis. But that now seems to be a thing of the past. Europeans have to recognize that defense will be expensive and will strain budgets in the years ahead.

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Opinion: NATO needs to rethink its strategy