Russian investigators say the police have detained the director of a Ukrainian library in Moscow on suspicion of inciting ethnic hatred.

The Russian investigative committee said in a statement on Thursday that it has asked a court to arrest 58-year old Natalya Sharina after the investigators found books in the library that allegedly disseminate "anti-Russian propaganda."

The Library of Ukrainian Literature stocks titles in Russian and Ukrainian, and gets funding from the Moscow city budget.

Relations between Russia and Ukraine have been soured by Russia's annexation of Crimea in March 2014 and its support for separatist rebels fighting government troops in eastern Ukraine. As a sign of the ongoing tensions, Russia and Ukraine on Sunday cut direct air travel between the two countries.