The dismal projection -- down from a forecast in April of minus five percent -- followed a two-week-long visit by an International Monetary Fund delegation to Kiev earlier this month.
Inflation in Ukraine will hit an estimated 46 percent, officials said, largely due to the skyrocketing price of oil and a large exchange rate depreciation in February.
The Fund's Ukrainian mission chief Nikolay Gueorguiev said in a statement summing up the preliminary findings from the May 12-29 meetings, said the talks were "constructive."
"In recent months, signs that economic stability is gradually taking hold are steadily emerging," said Gueorguiev.
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"The foreign exchange market has remained broadly stable. Gross international reserves, although still very low, have increased to US$9.6 billion at end-April. Banks' deposits in domestic currency have been recovering," he said.
The IMF last month made a risky new $17.5 billion loan to Ukraine after eight failed programs with the country, stressing the government was committed to discipline and reform after decades of government mismanagement and corruption.
Fund officials have said that as recently as 2013 there was no will among Kiev's leaders to undertake the reforms needed to right its economy -- especially to counter massive corruption -- but that that appears to have changed under its new leadership.
The strain of the war has emptied the government's coffers and run down its foreign reserves to a bare minimum, putting it on track to default on its huge debt load.