More pressure on Boeing, this time from Russia, where a subsidiary of state-backed defence conglomerate Rostec has filed a lawsuit in the US to cancel an order for 737 Max jets.
The news came as President Putin entertained Turkey's President Erdogan at the opening of the MAKS air show in Moscow.
According to the Financial Times, Rostec subsidiary Avia Capital Services said it gave Boeing a 35 million dollar deposit against 35 of the jets.
They and many other 737s have been grounded by airlines around the world following crashes that killed nearly 350 people.
Avia, the report said, was demanding that money back, plus interest and 75 million dollars in lost profit.
It also wanted 115 million dollars in compensation and further punitive damages of several times that amount Though a spokesman later told Reuters Avia was ready for an out-of-court settlement.
Another unit of Rostec was due, it announced, to be exhibiting more than 160 pieces of military hardware at the MAKS air show.
Rostec describes its mission as to improve lives through what it calls 'high-tech smart projects'.