By Sabine Siebold and Charlotte Van Campenhout MOSCOW/BRUSSELS (Reuters) -Russia said on Thursday that leaks spewing gas into the Baltic Sea from pipelines to Germany appeared to be the result of state-sponsored “terrorism”, as an EU official said the incident had fundamentally changed the nature of the conflict in Ukraine. The European Union is investigating the cause of the leaks in the Gazprom-led Nord Stream 1 and 2 pipelines and has said it suspects sabotage was behind the damage off the coasts of Denmark and Sweden. Four days after the leaks were first spotted, it remains unclear who mig…