The move is due to a high terrorism threat level.
Ukrainian Deputy Infrastructure Minister Yuriy Lavrenyuk says the ministry has proposed barring Russian ships from entering Ukraine's internal waters.
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According to the official, critical infrastructure facilities are located on the rivers of Ukraine. Therefore, the presence of Russian vessels is unacceptable there.
He also said that the ministry had transferred materials on unauthorized calls of vessels at the Crimean ports to the Ukrainian Ministry of Foreign Affairs to attach them to an international lawsuit against Russia.
The ministry also plans to strengthen measures to identify vessels illegally entering the closed ports in Russian-occupied Crimea.