A bitter debate over allowing the Air Force to use Russian-made rocket engines culminated Tuesday with an agreement for up to 18 of the engines.

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The Senate passed the agreement by voice vote as an amendment to the National Defense Authorization Act (NDAA), an annual defense policy bill.

Supporters of the engine, called the RD-180, hailed the amendment’s passage as necessary to protect assured access to space.

“The assets we send into space on rockets powered by the RD-180 are essential to our military’s ability to understand what is happening around the world,” Sen. Richard Shelby (R-Ala.) said in a written statement. “While we can all agree that the U.S. should not be dependent upon any foreign power — especially in the national security arena — it would have been far too dangerous to hastily restrict the use of the RD-180 before an American-made rocket engine is developed.”

The amendment was sponsored by Sen. Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (D-Fla.) and co-sponsored by Shelby and Sens. Cory Gardner Cory Scott GardnerJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' MORE (R-Colo.), Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.) and Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (D-Ill.).

The Air Force relies on the United Launch Alliance (ULA) — a Lockheed and Boeing joint venture — for national security space launches, and the ULA uses a launch vehicle reliant on the Russian engines.

Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) has been working to ban the engines, saying their sales enrich Russian President Vladimir Putin and his associates.

But the engine's supporters say forcing the Air Force to stop using them before a viable American-made alternative is ready would be costly and could cut off access to space. The Air Force wanted to use 18 of the engines until an American-made version is ready.

As originally written, the Senate’s NDAA would have allowed only nine of the engines.

Under the agreement approved Tuesday, the Air Force will be allowed to buy up to 18 of them. After 2022, the Air Force would no longer be allowed to buy any, however.

The House-passed version of the bill also allows for 18 of the engines.

McCain, who’s been furious at attempts to roll back limits on the engines, thanked Nelson for helping to broker the agreement.

“I know that the senator from Florida shares my commitment to freeing this nation from dependency on the use of Russian rocket engines, which then provides an economic boost, in some cases millions are dollars to Vladimir Putin and his cronies,” McCain said on the Senate floor.

Durbin said the agreement would allow the Air Force enough time to transition off the Russian engines.

“This agreement is a win for America’s national security and taxpayers,” Durbin said in a statement. “It will provide for a responsible transition to American-made engines and guarantee America’s access to space.”

Gardner, meantime, hailed the amendment as both protecting competition and national security.

“I’m proud that the Senate came together to ensure DoD has access to launch vehicles that it can afford,” Gardner said in a statement. “My amendment to the NDAA promotes competition by requiring the DoD to purchase rockets from certified providers that offer the best possible value. It also protects our national security by ensuring the DoD has the resources it needs to continue space exploration, which includes the ability to conduct a fair and open contracting process among certified launch providers.”