BRUSSELS (Reuters) -NATO is considering a longer-term military posture in eastern Europe to strengthen its defences, Secretary-General Jens Stoltenberg said on Monday, as tensions remained high over Russia’s military build-up near Ukraine. “We are considering more longer-term adjustments to our posture, our presence in the eastern part of the alliance. No final decision has been made on that but there is a process now going on within NATO”, he told reporters in Brussels. NATO defence ministers are expected to discuss reinforcements at their next meeting on Feb. 16-17. Western governments have …