A Russian-born U.S. citizen was sentenced to nearly 13 years in prison for drug-trafficking related charges in Moscow on Thursday, according to court officials.

Robert Woodland, born in Russia in 1991, was adopted by American parents at the age of two. Woodland returned to Russia at the age of 26 in order to meet his birth mother, he claimed.

Citing court officials, the Russian media outlet Interfax has stated that Woodland also holds Russian citizenship.

Woodland had been detained since January on attempted illegal drug trafficking charges which Russian government media claims are related to an organized group.

Woodland’s lawyer Stanislav Kshevitsky said Thursday they will appeal the ruling as his guilt has not been proven. Additionally, Kshevitsky cited Robert’s unspecified mental health issues as grounds for appeal.