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Russia's gas monopoly Gazprom halts natural gas sales to Ukraine, after Kiev refuses to agree to a four-fold price hike. The move has affected the flow of gas to other European countries and raised worries about Russia's use of energy as a political weapon.

A federal appeals court rules that the Environmental Protection Agency acted illegally when it issued new air-pollution rules for power plants and factories. The three-judge panel says the rules allowing plants to modernize without installing pollution-control equipment violated the Clean Air Act.

A Palestinian suicide bomber strikes at a fast-food restaurant in Tel Aviv, Israel. The attack kills the bomber and nine others, wounding dozens. Israel is marking the Passover holiday. It is the first suicide attack since Hamas took control of the Palestinian government.

G-8 leaders meeting in St. Petersburg, Russia, release a statement expressing "deepening concern" about rising civilian casualties on all sides of the violence in the Middle East. It also blamed the immediate crisis on "efforts by extremists forces to destabilize the region."

U.S. Deputy Secretary of State Robert Zoellick is in Nigeria, hoping to mediate a peace deal between rebels and government leaders in Sudan's Darfor region. The African Union has extended a deadline for talks to midnight Tuesday. The three-year conflict has led to nearly 200,000 deaths and 2 million refugees.

It is now up to a jury whether Zacarias Moussaoui is executed or is sentenced to life in prison. Family members of Sept. 11 victims are divided over Moussaoui's fate. The jury continues considering Moussaoui's fate Tuesday after deliberating for three hours Monday.

Renee Montagne speaks with reporter Alex Kleimenov in Kiev, Ukraine, about ceremonies taking place to mark 20 years since the Chernobyl nuclear disaster.

Among the topics: Matt Holzmann's story of the day he finally got a new kidney; Neil Young's protest music; and the old-fashioned -- and highly successful -- Anniston Star newspaper of Anniston, Ala.

More than 1,200 delegates are attending this week's White House Conference on Aging. Past conferences have led to major social change, including the creation of Medicare and Meals on Wheels. We look at what seniors are saying about the president's absence this year and other issues at the conference.

World leaders gather in New York with the goal of adopting reforms at the United Nations. The General Assembly has approved a document that touches on issues like human rights, world poverty and terrorism. But the document was watered down greatly in negotiations just prior to the summit.