Ukraine has been preparing for months to launch a counteroffensive against Russia's invasion, but the high stakes operation has seen many delays. Scientists are using a new method known as in vitro gametogenesis, or IVG, that could revolutionize the way babies are made. And if the government defaults on its debt, people will have a harder time borrowing money.

Florida Governor Ron DeSantis is set to announce his bid for the Republican nomination live on Twitter with CEO Elon Musk. Relations between Washington and Beijing have been tense lately, but China's new ambassador to the U.S. says he wants to get the two sides back on track. And, the United States is at risk of downgrading its AAA credit rating as debt ceiling negotiations drag on.

The Treasury department is preparing for the possibility of a national default by deciding which bills to pay first if President Joe Biden fails to strike a deal with House Speaker Kevin McCarthy on raising the debt limit. California, Arizona and Nevada are proposing new cutbacks to their use of the drought-stricken Colorado River to keep it from running dry. And, TikTok is suing the state of Montana to block a law that would put an outright ban on the popular video-sharing app.

President Joe Biden spoke with House Speaker Kevin McCarthy on his way back from Japan as they prepare to meet at the White House today to discuss the debt ceiling. Senator Tim Scott is announcing his bid for the Republican nomination for president in the 2024 race. And while gun regulations are being argued in court, the mayor of Columbus, Ohio is instating a curfew after a deadly month in the city.

The Colorado River has more dams on it than any other river in the United States. They were built to harness water high in the mountains and across the arid desert so people could build cities, industries and farms. But the visionaries of the past didn't account for the kind of population growth the southwest has experienced, and they didn't make a plan for what to do if there wasn't enough water to go around. Now, as the region suffers through a second decade of a mega drought, residents are scrambling to find solutions that will preserve their way of life. Today on The Sunday Story from Up First, we head to Las Vegas, where water conservation has a new starring role. This episode comes from a new podcast from Colorado Public Radio and reporter Michael Elizabeth Sakas. It's called Parched.