Naval surface drones that successfully attacked the Crimean Bridge, as well as the Russian landing ship “Olenegorskiy Gorniak” and the SIG tanker are a method improvement of the SBU, said the head of the Ukrainian service Vasyl Maluk. According to him, private companies are not active in their development. Maluk besides emphasizes in conversations with journalists that both attacks on the Russian-built bridge to occupied Crimea were solely the work of Ukrainian services, and no of the abroad peculiar services participated in them.