Boeing stopped buying Russian-made aluminum after the invasion of Ukraine, marking the second time the aircraft manufacturer has stopped buying from Russia.

Major operations in Russia were suspended by Boeing in March.

The company told the news agency that it sources the metal from around the world, but did not give any further information.

Boeing responded to Putin's invasion of Ukraine by closing offices in Russia and limiting maintenance and spare parts supplies to Russian-based Boeing planes.

The suspension of the titanium contract was one of the measures.

Boeing uses titanium and aluminum to make parts for its airplanes.

The company didn't reply immediately.

Rusal is the largest producer of aluminum in the world with 5.9% of production in 2019.

The move comes as Boeing continues to battle ongoing production delays that have affected deliveries of models including the 787 Dreamliner and the737 MAX, which was grounded following two crashes that killed almost 350 people in the last two years.

The shortage of parts and labor has made it difficult to deliver the plane. Problems procuring foam insulation meant that planes were rolling off the production line with unfinished cargo bays.

The airline bosses were not happy with the delays. The CEO of Ryanair, Europe's biggest airline by passenger numbers and a major Boeing customer, said on Wednesday that he was going to meet with Boeing executives to discuss the delays.

The airline has received 73 of the planes it ordered and expects another 21 by April. "We don't think they're capable of delivering," O'Leary said.

He accused Boeing management of being headless chickens.