Following a crescendo of terrifying violence, the Ukrainian uprising has had a surprisingly positive outcome. Contrary to all rational expectations, a group of citizens armed with not much more than sticks and shields made of cardboard boxes and metal garbage-can lids overwhelmed a police force firing live ammunition. There were many casualties, but the citizens prevailed. This was one of those historic moments that leave a lasting imprint on a society's collective memory.

How could such a thing happen? Werner Heisenberg's uncertainty principle in quantum mechanics offers a fitting metaphor. According to Heisenberg, subatomic phenomena can manifest themselves as particles or waves; similarly, human beings may alternate between behaving as individual particles or as components of a larger wave. In other words, the unpredictability of historical events like those in Ukraine has to do with an element of uncertainty in human identity.

People's identity is made up of individual elements and elements of larger units to which they belong, and peoples' impact on reality depends on which elements dominate their behaviour. When civilians launched a suicidal attack on an armed force in Kiev on 20 February, their sense of representing "the nation" far outweighed their concern with their individual mortality. The result was to swing a deeply divided society from the verge of civil war to an unprecedented sense of unity.

Whether that unity endures will depend on how Europe responds. Ukrainians have demonstrated their allegiance to a European Union that is itself hopelessly divided, with the euro crisis pitting creditor and debtor countries against one another. That is why the EU was hopelessly outmanoeuvered by Russia in the negotiations with Ukraine over an Association Agreement.

True to form, the EU under German leadership offered far too little and demanded far too much from Ukraine. Now, after the Ukrainian people's commitment to closer ties with Europe fuelled a successful popular insurrection, the EU, along with the International Monetary Fund, is putting together a multibillion-dollar rescue package to save the country from financial collapse. But that will not be sufficient to sustain the national unity that Ukraine will need in the coming years.

I established the Renaissance Foundation in Ukraine in 1990 – before the country achieved independence. The foundation did not participate in the recent uprising, but it did serve as a defender of those targeted by official repression. The foundation is now ready to support Ukrainians' strongly felt desire to establish resilient democratic institutions (above all, an independent and professional judiciary). But Ukraine will need outside assistance that only the EU can provide: management expertise and access to markets.

In the remarkable transformation of Central Europe's economies in the 1990s, management expertise and market access resulted from massive investments by German and other EU-based companies, which integrated local producers into their global value chains. Ukraine, with its high-quality human capital and diversified economy, is a potentially attractive investment destination. But realizing this potential requires improving the business climate across the economy as a whole and within individual sectors – particularly by addressing the endemic corruption and weak rule of law that are deterring foreign and domestic investors alike.

In addition to encouraging foreign direct investment, the EU could provide support to train local companies' managers and help them develop their business strategies, with service providers remunerated by equity stakes or profit-sharing. An effective way to roll out such support to a large number of companies would be to combine it with credit lines provided by commercial banks. To encourage participation, the European Bank for Reconstruction and Development (EBRD) could invest in companies alongside foreign and local investors, as it did in Central Europe.

Ukraine would thus open its domestic market to goods manufactured or assembled by European companies' wholly- or partly-owned subsidiaries, while the EU would increase market access for Ukrainian companies and help them integrate into global markets.

I hope and trust that Europe under German leadership will rise to the occasion. I have been arguing for several years that Germany should accept the responsibilities and liabilities of its dominant position in Europe. Today, Ukraine needs a modern-day equivalent of the Marshall Plan, by which the United States helped to reconstruct Europe after the second world war. Germany ought to play the same role today as the US did then.

I must, however, end with a word of caution. The Marshall Plan did not include the Soviet bloc, thereby reinforcing the Cold War division of Europe. A replay of the Cold War would cause immense damage to both Russia and Europe, and most of all to Ukraine, which is situated between them. Ukraine depends on Russian gas, and it needs access to European markets for its products; it must have good relations with both sides.

Here, too, Germany should take the lead. Chancellor Angela Merkel must reach out to President Vladimir Putin to ensure that Russia is a partner, not an opponent, in the Ukrainian renaissance.

Copyright: Project Syndicate, 2014.