US Ambassador to Ukraine Geoffrey Pyatt has urged Ukraine to carry fair reforms towards reaching a success of the state in a long-term perspective.

He wrote on Twitter on Wednesday that the US would urge Ukraine to carry the reforms fairly to guarantee success in a long-term perspective.

The diplomat also added a link to the material in which White House determined to provide remaining assistance to president and government of Ukraine despite posted "Panama Papers."

The papers of Mossack Fonseca law firm published on Sunday contain information on the alleged involvement of global leaders to tax evasion, money laundering and other frauds using offshore schemes. Poroshenko is among them.