British citizens are among those that will face new restrictions on adopting Russian children under a decree aimed at countries that permit gay marriage.
The decree, posted on the Russian government's website yesterday, is intended to "help improve the procedure for transferring children without parental care to families of Russian and foreign citizens, and to protect the rights and interests of these children".
It was signed into law by Dmitry Medvedev, the prime minister.
It includes a bar on adoptions by "those in a same-sex union recognised as a marriage and registered in accordance with the law of states in which such marriage is allowed, and also citizens of such states who are not married".
The wording suggests that in countries that allow gay marriage, only married heterosexual couples will be permitted to adopt children.
While the decree does not mention countries by name, gay marriage is legal in 15 countries, including France, Spain and Canada.
Legislation allowing same-sex marriage in England and Wales will come into force next month.
The Holyrood parliament has also approved same-sex marriage in Scotland.
US citizens have been banned from adopting Russian orphans since last year, under laws named after Dima Yakovlev.
Dima was a Russian boy who died in 2008 after his American adoptive parents left him in a parked car for nine hours.