With little optimism about the outcome of the latest peace talks, Ukraine says it will focus on military matters. Its team said it's trying to get a sense of what Moscow and Washington were "really ready for." Also: dozens are feared to have been killed by gunmen in central Nigeria. Walmart becomes the first "traditional firm" to become worth more than one trillion dollars. Water shortages worsen in parts of South Africa, with people fearing the prospect of "day zero." Iran allows female motorcyclists to obtain licences. Two former South Sudanese refugees walk the length of Britain to draw attention to the conflict in their home country. And the Muppet show celebrates its 50th anniversary with a new special episode.

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