Hello on this Monday, December 17, 2007. I'm Kristin Volk with a UPI headline update.Senator Joe Lieberman will back Senator John McCain for president. The Democrat turned Independent is planning to announce his plan today. An aide to Lieberman says the senator decided to endorse the Republican presidential hopeful because he considers him the most capable commander in chief and the best candidate to unite the country against Islamic extremism. The aide says the move isn't an endorsement of the Republican party, only the person. Lieberman will reportedly continue to caucus with the Democrats.Russia says it's begun to deliver fuel to an atomic power station in Iran that's been the center of concern over Tehran's nuclear program. A Russian nuclear equipment monopoly is reportedly building a $1 billion nuclear plant in that country under the control of the International Atomic Energy Agency. Construction on the Russian-designed facility has continued despite pressure from the U.S. The Russian Foreign Ministry says the Iranian side has provided written guarantees that fuel can only be used at and for that plant. Baghdad is calling on Turkey to stop military assaults on northern Iraq. This comes after yesterday's air strikes aimed at Kurdish rebels that killed a woman, injured four people, and destroyed a health clinic, a school, and bridges. Tensions have been high along the Iraqi-Turkish border, with Turkey threatening to launch a full-scale offensive against separatist guerrillas from the Kurdistan Worker's Party, or PKK.The U.S. is reviewing its mission in Afghanistan amid rising concerns about lagging progress there. The study is looking at the efforts of U.S. troops placed along Afghanistan's rugged border with Pakistan. U.S. commanders say they've seen an increase in attacks by the Taliban there. They also say the movement has become more diverse with warlords, drug bosses and local fighters joining in. This comes as officials boast about progress in Iraq, saying the country is experiencing its most significant dip in violence since the first year of the invasion.Thanks for watching today's update. Check out our weekly wrap-up from the White House and our special series called "Discovering Africa" on upi.com today.

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