Question

why is most countries women are not allowed to fly the planes and why one country may have taken this first step like Russia has taken​

Answer 1

Its just because women are more afraid than men so it actually happens all the time

Answer 2

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Today women's participation in the aviation sector is still low, but growing. As of 2010, just over 7% of certified civilian pilots (both private and commercial) in the United States were women. As of July 2014, approximately 5.12% of certified airline or commercial pilots in the United States are women.

Female pilots are rare, especially in the U.S. ... Just 6.3% of commercial pilots and 6% of non-commercial pilots in the United States are women, according to the Institute for Women of Aviation Worldwide, a nonprofit based in Vancouver. That's 6,081 commercial female pilots and 10,247 non-commercial female pilots.

While there certainly are fewer women training to be pilots, women also face gender-unique social pressures, double standards and systemic barriers that deter their entrance into aviation. Women have been interested in aviation since Wilbur and Orville gave up bicycles for airplanes at the turn of the 20th century.

So,sad.  :(