WASHINGTON, March 17 - Ukraine's finance minister on Tuesday said the country wants to be "flexible" in its discussions with sovereign bondholders over renegotiating its debt, and is not ruling out any form of agreement, including maturity extension, Reuters reported.

Finance Minister Natalia Yaresko also called on the United States to further boost its financial assistance to help rebuild confidence in Ukraine's economy as it struggles against pro-Russia separatists in the east. She declined to specify a specific figure.