A Ukrainian woman lured back to the United States by the FBI to face child pornography charges pleaded not guilty at arraignment Tuesday in federal court in Central Islip.

Olena Kalichenko, 27, arrived back in the United States on Saturday under the impression left by an FBI attaché in Kiev that she would only be a witness in a child pornography case brought against a Smithtown real estate investor, sources said.

The attaché did not reveal that she also faced child pornography charges, because there is no extradition treaty between the United States and Ukraine, the sources said.

The Smithtown man, Joseph Valerio, has been held without bail since March on charges of sexually exploiting a 3-year-old Ukrainian girl, and in a separate incident, a 6-year-old Smithtown girl, transportation of child pornography and possession of child pornography.

advertisement | advertise on newsday

Kalichenko knew Valerio when she lived in the United States and is accused of sexual exploitation of a child, transportation of child pornography, and production of sexually explicit depictions of a minor for importation into the United States.

Kalichenko's attorney, federal public defender Randi Chavis, asked that she be released on bail, noting that her client had been acting in good faith and had even paid for own ticket on the Saturday flight from Ukraine to Kennedy Airport, where she was arrested.

But U.S. District Judge Joseph Bianco agreed with federal prosecutor Allen Bode that because of the lack of an extradition treaty, Kalichenko was a flight risk and ordered her detained.

Kalichenko faces a minimum sentence of 15 years on each count if convicted, according to Eastern District spokesman Robert Nardoza.