PRAGUE/SAO PAULO (Reuters) -The Czech Republic said on Tuesday it had started talks with Embraer on the possible acquisition of two C-390 Millennium military transport aircraft, lifting shares of the Brazilian planemaker. The move comes after neighbouring Austria tapped the C-390 Millennium to refresh its fleet in a possible joint order with the Netherlands, underscoring demand for the new aircraft aimed at replacing Lockheed Martin's Hercules C-130s. Embraer shares rose more than 1.5% on the news, among the top advances on Brazil's benchmark stock index, which was near flat.