Russia has acknowledged European complaints over lower natural gas supplies, with Prime Minister Vladimir Putin saying state energy company Gazprom faced increased Russian demand because of the extreme cold, dpa cited Interfax news agency as reporting. Putin said that Gazprom would do its best to meet the needs of its European partners. Gazprom deputy chairmen Alexander Medvedev and Andrei Kruglov, who met Putin Saturday, said the company was delivering as much gas as it could under the current conditions.