Russias top natural gas producer Gazprom has signed a deal to buy 100 percent of shares of Kyrgyzgaz for $1 and assumed the responsibility to repay $40 million of debt owed by the Kyrgyz gas producer, Itar-Tass reported. Gazprom also pledged to invest no less than 20 billion rubles ($560 million) in the next 5 years in the Central Asian republics 700-kilometer gas distribution grid upgrades.