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Washington • The spaceflight company backed by billionaire Jeff Bezos will team up with a Boeing-Lockheed Martin venture to develop a U.S alternative to Russian-made rocket engines.

The partnership between United Launch Alliance and Bezos's Blue Origin has set a four-year development schedule, with full testing to begin in 2016 and a first flight in 2019, according to a statement today from the companies. The Boeing-Lockheed venture currently handles all U.S. military satellite launches.

The announcement pits Bezos, 50, against fellow billionaire Elon Musk, the Tesla Motors founder who is developing a rocket and capsule through his Space Exploration Technologies Corp. business. The competition has been brewing for years and has intensified as availability of the Russian-made RD-180 engines commonly used in U.S. space launches is being threatened by diplomatic tensions over Russia's conflict with Ukraine.

"It's time for a 21st Century booster engine," Bezos, the founder of retailer Amazon.com Inc., said at a news conference Wednesday in Washington. The engine will be 100 percent built and tested in the United States, he said.

Blue Origin's BE-4 engine has been under development for three years, and is high-performing while being low-cost, Bezos said.

The competition is bigger than launching satellites. The National Aeronautics and Space Administration Tuesday said Boeing and SpaceX would split $6.8 billion in federal funding to build the first U.S. manned craft since NASA retired the shuttle fleet in 2011. In 2017, the Boeing-SpaceX craft would replace NASA's sole use of Russia's Soyuz rockets to get people to the station, an arrangement that costs about $70 million a seat.

United Launch Alliance uses in some of its flights Atlas V rockets, which rely on the RD-180 engine. U.S. dependence on a Russian-made engine has prompted criticism in Congress since Russia annexed Ukraine's Crimea region earlier this year.

The U.S. and the European Union have imposed economic sanctions on Russia in an attempt to get President Vladimir Putin to back down. Russian Deputy Prime Minister Dmitry Rogozin hinted in May that his country would cut off the supply of the engines to the U.S. in retaliation for the diplomatic tensions.

In April he suggested via Twitter that the U.S. consider sending crews to space "with a trampoline."

The NASA contract to ferry astronauts to the International Space Station will pay a maximum of $4.2 billion to Boeing and $2.6 billion to closely held SpaceX. Boeing and SpaceX may each conduct as many as six missions as part of the Commercial Crew Transportation Capability contract, NASA said.

NASA said Tuesday it will continue to work with Blue Origin and another spaceflight company, Sierra Nevada, as they refine spacecraft designs.

Boeing was a crucial partner in NASA's Apollo and shuttle programs, and the United Launch Alliance has an exclusive contract to carry U.S. military payloads.

Last month, the U.S. Air Force issued a "request for information" from industry on potential options to replace the RD-180 engine.

For now, Russian and American astronauts continue to train together for Soyuz missions amid strained ties between the two countries.

U.S. astronauts are slated to blast off for the space station in Russian launch vehicles on Sept. 25 and Nov. 23, according to a schedule posted on NASA's website.

Bezos, who is also the new owner of the Washington Post, is No. 21 on the Bloomberg Billionaires Index, a ranking of the world's wealthiest people, with an estimated net worth of $30 billion. Musk, 43, is ranked at No. 93 with a net worth of about $12.3 billion.