Inquiring minds want to know

This is a late pile on but it's hard to resist.

Barack Obama's comment on sending troops to Pakistan may have been a mistake
but it is one he is standing by. His website (no, I won't link to it) notes:

We must stop fighting the wrong war and start fighting the war we need to win.
.... We must reinforce our mission in Afghanistan with additional troops. We
must press Pakistan and President Musharraf to close down terrorist training
camps .... If Musharraf acts, we will stand with him. But if Pakistan will not
act against Osama bin Ladin and the terrorists who killed 3,000 Americans, we
will.

It will be interesting to see how big the Democratic party constituency is for a candidate who promises to send more troops to Afghanistan and to invade Pakistan, to boot. What I want to know:

Does Obama intend to act unilaterally?

If not, how many members of the UN Security Council must approve before we send troops to Pakistan?

If Musharraf is overthrown and a Taliban style government takes control of Pakistan's nuclear weapons (as big a nightmare to New Delhi as to Tel Aviv), would Obama support a strike against the Pakistani nuclear facilities? He says he would never use American nuclear weapons; would he support India if they used their own?