The country has been riven in recent months as Russia has taken over the Crimea and demanded the country immediately pay off huge gas debts, while pro-Moscow insurgents in other regions have clashed with government troops as they push for greater autonomy from Kiev.
"The crisis in Russia and Ukraine is having a severe impact on the economies of the two countries," the European Bank for Reconstruction and Development said in a report released at its annual conference in Warsaw.
The International Monetary Fund (IMF), which last month approved a USD 17-billion aid package for Ukraine, has forecast a 5.0-per cent contraction to the nation's economy this year.
At the start of the year, before the outbreak of the crisis, the EBRD had forecast that Ukraine's economy would grow by 1.5 per cent in 2014.
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Ukraine's interim President Oleksandr Turchynov today said that Russia's hotly disputed annexation of Crimea in March had cost his country about USD 100 billion.
He added: "We think that the uncertainty is so high that we need to think through different scenarios" when making growth forecasts.
The EBRD was founded in 1991 to help ex-Soviet bloc countries such as Ukraine and conference host Poland make the transition to free-market economies and democracy.
Today, the bank forecast Russia's economy to post zero growth this year and expand by only 0.6 per cent in 2015, as investors place their money elsewhere.
In January, it had expected Russia to grow by 2.5 per cent in 2014 but noted that in the first quarter of this year, private-sector capital outflows reached USD 64 billion, exceeding the annual amount for the previous year.