Kyiv lacks in information from Russia regarding the investigation into an incident in the Sea of Azov in which four Ukrainian fishermen were killed and one survived and was detained in Russia.

"We think that this cooperation in a joint investigation, which Ukraine demanded in the first few days following the tragedy, is insufficient. The Ukrainian side has received little information on Russia's investigation into this incident, which caused the death of four our compatriots," Director of the Information Policy Department at the Ukrainian Foreign Ministry Yevhen Perebyinis said at a press briefing in Kyiv on Tuesday.

Kyiv hopes that the investigation into the incident in which four Ukrainians were killed and the case against Ukrainian fisherman Oleksandr Fedorovych will be fair, and the Ukrainian side will have access to all necessary information, Perebyinis said.

"We hope that Russia will respond to all of our requests," he said.

As reported, a Ukrainian fishing vessel and a Russian patrol boat collided in the Sea of Azov off the coast of the Russian village of Vorontsovka at about 1800 on July 17.

The fishing boat capsized and, as a result, four Ukrainians died and one survived. The Ukrainian survivor, Oleksandr Fedorovych, underwent surgery on July 19 in a hospital in Yeysk, in Russia's Krasnodar territory.

A criminal case against the surviving fisherman is being investigated in Russia. Russian law enforcement authorities have already charged the Ukrainian national under Part 3, Article 256 of the Russian Criminal Code (illegal fishing). Fedorovych is facing up to two years in prison.