By Marek Strzelecki and Robert Muller WARSAW/PRAGUE (Reuters) -Russia’s president said Europe was to blame for its energy crisis with policies that starved the oil and gas industry of investment and said price caps would make it worse, as EU states tried to forge a deal on ways to contain soaring energy costs. Worries about the security of energy supplies were heightened on Wednesday when a leak in Poland on the Druzhba pipeline from Russia reduced the flow of oil to Germany. Poland said the leak was probably caused by an accident but it came as European Union nations are seeking to wean thems…