aren't C-802 NATO compliant ? We shot one of those from an ex-Dutch frigate and the Luursen FPB-57sBN is also aiming to get ships from the west, C-802 is less likely to be on those.
Maintenance cost of the ships quadratically increases after 10th year. The increase becomes dramatic after 30 years. (Very rough numbers, assuming the expected life is 40)
I am well aware of this, but never know the exact numbers, thanks for the info.