pipeline network. Immediately following the signing of this agreement, Belarus declared a $42/ton transportation tax on Russian oil travelling through the Gazprom pipelines crossing its territory. On 13 March 2008, after a three-day period where gas supplies to Ukraine were halved, Gazprom agreed to supply Ukraine with gas for the rest of the year. The contract removed intermediary companies. On 1 April 2014, Gazprom increased the gas price charged to Ukraine from $268.50 to $385.50 (£231.00) per 1,000 cubic metres. Ukraine's unpaid gas bills to Russia stood at $1.7bn (£1.02bn). On 30 October 2014, Russia agreed to resume gas supplies to Ukraine over the winter in a deal brokered by the European Union. Corporate affairs Gazprom is a vertically integrated company, one which owns its supply and distribution activities. Gazprom owns all its main gas processing facilities in Russia. It operates Russia's high pressure gas pipelines and since 2006, it has held a legal export monopoly. Other natural gas producers, such as Novatek, Russia's second largest gas company, are forced to use Gazprom's facilities for processing and transport of natural gas. At the end of 2008, Gazprom had 221,300 employees in its major gas production, transportation, underground storage and processing subsidiaries. Of these employees, 9.5 percent were in management, 22.9 percent were specialists, 63.4 percent were workers and 4.2 percent were other employees. Gazprom's headquarters were in the Cheryomushki District, South-Western Administrative Okrug, Moscow until 2021, when they moved to the Lakhta Centre in Saint Petersburg. Gazprom is a national champion, a concept advocated by Putin, in which large companies in strategic sectors are expected not only to seek profit, but also to advance Russia's national interests. For example, Gazprom sells gas to its domestic market at a price less than that of the global market. In 2008, Gazprom's activities made up 10 percent of the Russian gross domestic product Due to its large projects, including international pipes like Nord Stream 1 and Turkish Stream, Gazprom is a substantial source of revenue for several domestic suppliers and contractors. Shareholders , Gazprom's main shareholders were the Federal Agency for State Property Management with 38.37% and Rosneftegaz with 10.97%. Together with a 0.89 share of Rosgazifikatsiya, they guaranteed a majority control of the company by the Russian government. The rest of the shares were held by investors, including 25.20% by ADR holders on foreign stock markets, and 24.57% by other legal entities