The EU believes damage to the Nord Stream gas pipelines last month was the work of sabotage and suspicion has fallen on Russia, but it is not known for sure who was responsible. News reporter @MikeRDrummond A deliberate attack on NATO energy supplies will be met with a "united and determined response", the alliance's chief has vowed. Secretary-General Jens Stoltenberg pledged to boost protection of critical infrastructure in response to the damage to the Nord Stream gas pipelines. The EU believes three leaks in the pipelines last month were the work of sabotage and suspicion has fallen on Russia, but it is not known for sure who was responsible. Mr Stoltenberg said NATO has doubled its presence in the Baltic and the North Sea to more than 30 ships supported by aircraft and undersea activities. Putin 'moves Iranian drones into Belarus' - Ukraine war latest updates In a speech on Tuesday, he also said the alliance is monitoring Russia's nuclear forces closely as the country was "losing o