Russian President Vladimir Putin speaks during a session of the State Council at the Kremlin in Moscow, December 27, 2012. Putin said on Thursday he saw no reason not to sign a bill into law that would ban Americans adopting Russian children and promised measures to improve care of his country's orphaned youngsters. REUTERS/Natalia Kolesnikova/Pool (RUSSIA - Tags: POLITICS SOCIETY)

Russia's controversial ban on adoptions of Russian children by American families came into force on Tuesday, days after its signing by President Vladimir Putin sparked an international outcry.

The ban is part of a law rushed through parliament to hit back at the United States over its passing of a law sanctioning Russian officials implicated in the death in jail of lawyer Sergei Magnitsky in 2009.

But opponents say it makes Russian orphans - many with physical or mental difficulties - the victims of a diplomatic standoff between Washington and Moscow.

The law came into force as expected after being signed by Putin on December 28, Russian state media said.

It also forbids US citizens who are deemed to have hurt the rights of Russians from entering Russia and allows the authorities to shut down NGOs funded by the United States.

The ban on adoptions caused an unusual amount of dissent within the political establishment, with Foreign Minister Sergei Lavrov indicating his discomfort and Deputy Prime Minister in charge of social policy Olga Golodets vehemently opposed.

The anti-Putin opposition is trying to play on the splits within the elite by holding a mass rally against the law on January 13 in central Moscow which organisers hope will muster up to 20,000 people.

The idea of a march through central Moscow ending at the State Duma which passed the law has not found favour with the city hall and tough negotiations on agreeing a route are expected after the new year holidays.

Activists have said that American families were in particular prepared to adopt ill Russian children and the law risks consigning the most disadvantaged to orphanages for the rest of their childhood.

There is also concern about over 50 children caught in limbo after the law thwarted ongoing adoption processes, where in some cases the orphans had already met future adoptive parents.

Kremlin children's rights envoy Pavel Astakhov has promised they will be found Russian families who will be specially selected by regional governors.

Astakhov has also raised the prospect of the Kremlin banning all foreign adoption in the future, leaving some to conclude the aim is to show Putin's Russia as a strong nation in no need of foreign help. - Sapa-AFP