KINSHASA: Democratic Republic of Congo said on Sunday it had begun talks with Zambia a day after its southern African neighbor sealed their common border, blocking a key export route for Congo, the world’s second largest copper producer. Zambian Trade Minister Chipoka Mulenga announced a temporary border closure on Saturday after a Congolese ban on imported soft drinks and beer led to demonstrations by Congolese transporters in the town of Kasumbalesa on the Zambian border.