The Russian state-owned defence company Rostec expressed its willingness to join the TF-X program during the 2018 Eurasia Air Show. Some Russian companies, including the United Engine Corporation, have also stated that they were ready to provide technology for the TF-X engine. Turkish defence officials confirmed that they were exploring this option and discussing potential cooperation models. Turkish President Recep Tayyip Erdoğan, accompanied by Russian President Vladimir Putin, observed the fifth-generation Sukhoi Su-57 stealth fighter jet at the MAKS 2019 international airshow near Moscow on 27 August 2019.
