Elon Musk's success in launching reusable space rockets means Russia must make its own projects cheaper as the cash-strapped country struggles to retain its share of the market, the country's defense-industry chief said.

"The main goal today is to make space cheap," Deputy Prime Minister Dmitry Rogozin, who's in charge of defense, told Rossiya 24 TV in an interview on Wednesday in Moscow. "Competitors are stepping on our toes. Look at what billionaire Musk is doing with his projects. This is very interesting, well done, and we treat this work with respect."