Ukrainian President Petro Poroshenko has said the entry of more than 100 Russian aid trucks into the country is a "flagrant violation of international law."
In a statement on his website, he added none of the trucks' cargo had been checked before being driven in.
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South Korea’s presidential office said Mr Moon will personally announce the outcome of Saturday’s summit with Mr Kim on Sunday.
Some customers are suspected of passing the expensive items off as carrots at self-service tills by switching labels.
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