REUTERS The Russian government has banned the exports to Ukraine of Russian oil and petroleum products, Prime Minister Dmitry Medvedev told a government meeting on Thursday, according to an UNIAN correspondent in Russia. "A ban is being introduced on the export to Ukraine of Russian oil and petroleum products," he said. Medvedev said that he had signed the corresponding decree. Exports of coal are possible only after a special permit is obtained. Medvedev also announced an expansion of the ban on the imports of some Ukrainian goods. "We have to defend our interests and take retaliatory measures," the Russian prime minister said. Read alsoUkraine&#39;s Cabinet expands list of banned goods from Russia “I signed a government decree on this issue. We are expanding the ban on the imports into Russia of certain types of goods; this measure will affect Ukrainian products of engineering, light industry, and metalworking, the cost of which amounted to nearly $250 million over the past year,” Medvedev said. As UNIAN reported earlier, Ukraine has banned the imports from Russia of formalin, urea-formaldehyde concentrate and resins, springs for bogies of freight cars (cylindrical outer helical springs and cylindrical inner helical springs), equipment for switching or protecting electrical circuits (relays), which are used in railway automation devices for signaling and communications, as well as electrical conductors for voltage over 1000 V. In addition, the list includes glass canning jars, bottles for food and beverages made of colorless and colored glass, and other glass containers.