Su-57: fresh or old?

Photographs of aircraft appeared uncensored. They show aircraft registration numbers and tactical numbers — ‘Red 25’ and ‘Red 26’. Russian commentators say these are fresh markings, which are not yet known so far, indicating that we are dealing with fresh aircraft. In their view, this would be evidence of speeding up the production of these aircraft in order to complete the delays and losses (as far as we know about 1-2 aircraft damaged in airbase raids).