Sentsov and another Ukrainian from Crimea, Alexander Kolchenko, have been held since May 2014 are accused of setting a pro-Kremlin party office on fire and wanting to blow up a statue of Vladimir Lenin in Crimea's main city Simferopol.
Prosecutors also asked the court to jail Kolchenko, a pro-Kiev activist in Crimea who opposed the peninsula's annexation by Moscow last year, for 12 years.
Supporters of the two men, who are being tried as Russians despite never applying for Russian citizenship, say the case against them has been fabricated, and both the European Union and the United States have called for their release.
In the latest appeal by the European Film Academy on Tuesday, 15 movie makers, including Britain's Ken Loach and Germany's Wim Wenders, said they were "deeply worried" by the proceedings.
"We are shocked that the accusation of Oleg Sentsov having committed 'crimes of a terrorist nature' is still being upheld," letter to Putin said.
Defence lawyers say witnesses have been tortured to produce testimony implicating Sentsov and Kolchenko in activities involving Ukrainian far-right organisation Right Sector, which is banned in Russia.
Amnesty International last month said there were "serious concerns regarding the two men's rights to a fair trial" due to excessive charges and allegations of torture.
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