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The question that arises though is did Morgoth even need to invade them. Despite everything, i do not think Morgoth was a fool. Look at it like this, Morgoth manipulated Feanor to cause him to raise his hand against Fingolfin and thus get banished. Afterward, Morgoth's lust led him to steal the silmarills knowing full well that it would cause Feanor to leave Valinor and rebel against the Valar. If the teleri were to follow Feanor, it would have sertved his purposes by having more rebel against the valar, but since they did not, his purposes were served even better.
The Noldor's slaughtering of the Teleri drove a wedge between the sons of Feanor and the kingdom of Thingol, thus causing the isolation of Doriath. Morgoth did not need to invade Menengroth to achieve his purposes, all he had to do was keep them out of the fight until his victory over the Noldor was guaranteed. In a war it is always a good strategy to let the neutrals remain neutral until your enemy is dealt with. You do not want to attack someone who is going to sit out anyway unless victory is guaranteed.
It is even better to use someone else to do your dirty work for you, and this is what Melkor did by manipulating Hurin, and then setting off the snowball that would lead to the dwarven attack. He also knew that when the girdle was broke, the sons of Feanor would have no choice but to take the silmarill from them by force. When you can get your enemies to fight eachother, you have no need to use your own manpower.
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