WASHINGTON — President Donald Trump said he could not blame Turkey for buying a Russian missile system, a move that resulted in dropping the NATO ally's participation in the F-35 program.

"I don't blame Turkey because there are a lot of circumstances and a lot of ... problems that occurred during the Obama administration," Trump said. "This dates back to the Obama administration, which was a disaster."

Trump, who spoke to reporters at the White House, did not elaborate on whether he would impose sanctions on Turkey for doing business with the Kremlin. Under the Countering America's Adversaries Through Sanctions Act, which the president signed in August 2017, Turkey could face economic sanctions for buying the Russian-made missile system.

"It's a tough situation. They're getting the S-400 and our statues and everything else — as you do that, you just can't order this equipment," Trump said. "And generally speaking, you can't order equipment period."

Earlier this month, Turkey accepted delivery of the S-400, a mobile surface-to-air missile system, that is said to pose a risk to the NATO alliance as well as Lockheed Martin's F-35 stealth fighter jet.

In 2017, Ankara brokered a deal reportedly worth $2.5 billion with the Kremlin for the S-400 despite warnings from the U.S. that buying the system would come with political and economic consequences.

The S-400, the successor to the S-200 and S-300 missile systems, made its debut in 2007. Compared with U.S. systems, the Russian-made S-400 is believed to be capable of engaging a wider array of targets, at longer ranges and against multiple threats simultaneously.

In multiple efforts to deter Turkey from buying the S-400, the State Department offered in 2013 and 2017 to sell the country Raytheon's Patriot missile system. Ankara passed on the Patriot both times because the U.S. declined to provide a transfer of the system's sensitive missile technology.

All the while, Turkey became a financial and manufacturing partner in Lockheed Martin's F-35 jet, the world's most advanced fighter.

Last week, the White House said in a statement that it made "multiple offers to move Turkey to the front of the line to receive the U.S. Patriot air defense system," which CNBC reported in April.

"Unfortunately, Turkey's decision to purchase Russian S-400 air defense systems renders its continued involvement with the F-35 impossible. The F-35 cannot coexist with a Russian intelligence collection platform that will be used to learn about its advanced capabilities," the White House said last Wednesday, adding that there will be "detrimental impacts" on Turkey's participation in NATO.