Iran welcomes a potential "fair and balanced" US nuclear proposal, but Tehran has not received any proposal for negotiations, the country's top diplomat said on Saturday."If we receive a reasonable, balanced, and fair proposal from the Americans for negotiations, we will certainly consider it," Iran's Foreign Minister Abbas Araghchi told state television.However, Araghchi said Tehran will not give up its "right to enrich uranium" but can take confidence-building measures regarding "the peaceful