Israel launches new airstrikes in Gaza, killing more than 400 Palestinians, and shattering a fragile ceasefire deal with Hamas. How Israeli Prime Minister Benjamin Netanyahu is justifying the attack, how he's also warning that it's "only the beginning," and what families of Hamas' hostages are dreading. Russian President Vladimir Putin has rejected the full 30-day, American-brokered ceasefire that Ukraine was pressured into accepting. What Putin is demanding instead, and where it leaves Ukraine. Plus, why experts say Canada's spring housing market is "dead on arrival." And splashdown: two NASA astronauts finally return safely to Earth after an unexpected nine-month stay in space.