According to RIA Novosti, citing a statement from the Chancellery of the Haitian Prime Minister, the mourning will last from 8 to 22 July.
On July 7, it became known that the President of Haiti was fatally wounded in an attack on his residence.
A state of emergency has been declared in the country.
UN Secretary General Antonio Guterres called on Haitian citizens to adhere to constitutional order and refrain from violence following the assassination of the president.
The Russian Foreign Ministry expressed condolences to the people and government of Haiti.