Ukraine says it's captured 100 Russian servicemen as it continues its cross-border incursion. International mediators prepare for crucial Gaza ceasefire talks but a sources tells CNN that Hamas won't attend. Japan's prime minister says he'll step down in September. And, NASA says it still hasn't decided how it will get two astronauts stranded on the ISS back to earth. All that and more with Paula Newton, in for Julia Chatterley.

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