Dhaka, April 14 -- Iran and the US said they held "positive" and "constructive" talks in Oman on Saturday and agreed to reconvene next week in a dialogue meant to address Tehran's escalating nuclear programme, with President Donald Trump threatening military action if there is no deal."I think we are very close to a basis for negotiations and if we can conclude this basis next week, we'll have gone a long way and will be able to start real discussions based on that," Iranian Foreign Minister Abbas Araqchi told state television.Araqchi said the talks - the first between Iran and a Trump administration, including his 2017-2021 first term - took place in a "productive, calm and positive atmosphere"."Both sides have agreed to continue the tal...