I would think a lot of the Titanium comes from a factory outside Zapirizhzhia, my wife is from there.....
Her father worked on the factory, one of the major Titanium plants in that area.... when something went wrong there, it was only one thing to do, run like h#ll; Titanium has a melting point of 3034 °F, so those ovens...... very very scary things
I can strongly recommend the book "SLED Driver, Flying the world's fastest Jet" by Brian Schul
Immensely nicely written lots of insight info and great photos....
Hard to get though, hardcopy's cost an arm and a leg and some more, some copies floating around the Internet though