Renault Korea Motors, the South Korean unit of France's Renault S.A., said Wednesday its June sales plunged from a year earlier due to weak demand in both the domestic and overseas markets. The automaker sold 4,651 vehicles last month, down 45.7 percent from a year earlier, the company said in a release. Domestic sales dropped 32.2 percent on-year to 3,400 units last month, while overseas sales tumbled 45.7 percent to 4,651 units. Renault Korea's cumulative sales in the first half of this year reached 33,384 units, down a sharp 29 percent from a year earlier. Domestic sales fell 24.5 percent on-year to 21,187 units in the first six months of this year, while exports dived 35.7 percent to 12,197 units.