Currently, family benefits for U.N. staff members are determined  by their country of origin.

The secretary-general has been an outspoken supporter of LGBT rights, and U.N. deputy spokesman Farhan Haq said he is making the change "within his authority as the manager of the U.N. system."

However, additional funding to pay for the new benefits must be approved by the General Assembly's budget committee.

Diplomats said they expect a close vote.

Russia strongly opposes same-sex marriage and has adopted laws restricting gay rights activities.

--Sapa-AP--