The newly created Mil Mi-4 article has the following quote;
I'm seriously interested what is meant with recent years, as I think the Mi-4 was phased out of service many moons ago. Also I'm not sure whether the Chinese still use the Z5.A number remain in current use (mainly in China as the Z-5), and in recent years conversions have been reported in Soviet use for ASW (“Hound-B”), armed close support and ECM (“Hound-C”).
Cheers,
Hans