In total, Kommersant estimates the costs of integrating Crimea into Russia in $30 billion over the next decade, i.e. $3 billion per year. Western oil expertsestimate that Russia's seizing of Crimea, and the associated control of an area of Black Sea more than three times its land area gives it access to oil and gas reserves potentially worth trillions of dollars. It also deprives Ukraine of its chances of energy independence. Moscow's acquisition may alter the route along which the South Stream pipeline would be built, saving Russia money, time and engineering challenges. It would also allow Russia to avoid building in Turkish territorial waters, which was necessary in the original route to avoid Ukrainian territory. This pipeline was later canceled in favour of TurkStream, however. The Russian Federal Service for Communications (Roskomnadzor) warned about a transition period as Russian operators have to change the numbering capacity and subscribers. Country code will be replaced from the Ukrainian +380 to Russian +7. Codes in Crimea start with 65, but in the area of "7" the 6 is given to Kazakhstan which shares former Soviet Union +7 with Russia, so city codes have to change. The regulator assigned 869 dialling code to Sevastopol and the rest of the peninsula received a 365 code. At the time of the unification with Russia, telephone operators and Internet service providers in Crimea and Sevastopol are connected to the outside world through the territory of Ukraine. Minister of Communications of Russia, Nikolai Nikiforov announced on his Twitter account that postal codes in Crimea will now have six-figures: to the existing five-digit number the number two will be added at the beginning. For example, the Simferopol postal code 95000 will become 295000. In the area that now forms the border between Crimea and Ukraine mining the salt lake inlets from the sea that constitute the natural borders, and in the spit of land left over stretches of no-man's-land with wire on either side was created. On early June that year Prime Minister Dmitry Medvedev signed a Government resolution No.961 dated 5 June 2014 establishing air, sea, road and railway checkpoints. The adopted decisions create a legal basis for the functioning of a checkpoint system at the Russian state border in the Republic of Crimea and Sevastopol. In the year following the annexation, armed men seized various Crimean businesses, including banks, hotels, shipyards, farms, gas stations, a bakery,