First is Yak 23,
Second Yak 17
You can see it because the Yak 17 has is weapons at the top of the hull
The Yak 23 has its weapons at the bottom of the hull
The Yak 23 is the end of the Line Yak 15/17/23
In reality it was a modified Yak 3 with jet engines. It was an aircraft to give soviet pilots the first experience in Jet flying in a more or less familiar looking aircraft.
Rules to fly a Yak 15:
https://www.youtube.com/watch?v=LSfmMYsztAwNote: this aircraft has Tail wheel landing gear, source of many problems. Yak 17 and 23 has tricycle landing gear.
All of them have the RD-10-engine, a copy of the Junkers Jumo 004, known from the Messerschmitt Me 262.
https://en.wikipedia.org/wiki/Yakovlev_Yak-23https://en.wikipedia.org/wiki/Yakovlev_Yak-17No. 3 is
MiG 9, the first Jet from Mikoyan and Gurevich.
It was a design like the Lockheed F-80, but a bit later.
https://en.wikipedia.org/wiki/Mikoyan-Gurevich_MiG-9No 4 is
the Last, not shure. Think it is the Lavochkin La 200 all-weather-interceptor.
It was never built in serial production.
https://en.wikipedia.org/wiki/Lavochkin_La-200Interesting the Yak 3 (or 9?) left and the Petljakow Pe 2 on the right side in the background...