Nokia shadow investors conspiracy

It seems that when shares of Nokia go down, Microsoft goes up. (Actually it seems like MS often goes up when everyone goes down, as if they directly benefit from the misery of others.)

I've heard that most of Nokia's shares are owned by groups who have a greater stake in MS. If MS "needs" Nokia, and if MS can buy Nokia when their shares are low enough, then those who own both may find it helpful to sacrifice Nokia as long as MS benefits.

This of course isn't fair to those who only own Nokia shares. Does that matter? Do the laws say that a company must make the most profit for its shareholders, or can it do whatever a majority of the shareholders want? Do the non-MS shareholders have grounds to sue? Would they have to prove there was an explicit conspiracy to devalue Nokia?

It seems to me, the controlling ownership of Nokia is not acting in its best interests but in external interests, and may even have installed a CEO with external interests.