Iraq

The US and UK armies should leave Iraq. Their presence is more destabilizing than stabilizing.

They should be replaced with a mixed force of Shiite and Sunnite.
Iran, Egypt and Pakistan can be contributors to this force, plus the Iraqi official army.

By including Iran, we show this nation that the international community is willing to trust it. By giving Iran responsibility we are encouraging it to behave more responsibly. It can be used as a leverage to ensure a nuclear free Middle East. The US must at the same time pressure Israel to dismantle its nuclear arsenal (this will be a tough one, but guarantees can be offered to Israel or economic sanctions imposed).

Iran must not try to annex certain parts of Iraq. This will need to be carefully monitored by the UN.

Iran will have the task to disarm the Shiite militias. Egypt and other Sunnite forces will have to curb Sunnite militias.

Democracy may be a source of civil war for the time being in Iraq. Each sect is "democratically" asking for more power! Hence, in the interim, a UN sponsored government can be put in place and whose task is to ensure that all sects are equitably served by a new constitution (in large part inspired from the current constitution). All sects should have their rights protected. The constitution will be democratically amended in a few decades, when democracy is ripe.

The UN sponsored government will essentially be designated by current Iraqi political entities as well as Iran, Egypt, Pakistan, Saudi Arabia, etc.

Tough luck Iraq!