But you are ignoring fact that the MOST of ukrainians joined not to the UPA but to the Soviet partisans ( especially in the central and easter-southern regions).
In fact that the Soviet partisans WERE the most mass ANTI-GERMAN force in Ukraine till the 1944.
Most of Ukrainians were mobilised to the Red Army. The refusal to join the Red Army meant death.
Southern and Esatern regions were free from any mass partisan movements as there are steppes and it was impossible to establish partisan bases and kept them in secret from Germans.
The Soviet partisan movement in Ukraine originated and concentrated in the north-eastern forest territories of Ukraine.
You seemed to agree that Official Soviet WWII history mentions that in 1944 there were 250.000 Soviet partizans active in Belarus, Russia, Ukraine. And 185000 partizans got medal (during or after the war). The Soviet partisan movement lasted 3 years( 1941-1944)
OUN units later became known as UPA fought since 1941 - till late 1950s. As a result during all these years over 700000 men volonteered to participated in the UPA war against German troops, Polish AK and punitive NKVD units
But they betrayed not the USSR, thay betrayed the our Anti-germnans coailitin. Theu fight not as much with Germans as with polish AK and Soviet partisans and troops ( who fight agaist fascist).
And they betrayed and fought with the GIANT part of Ukraines who sincerely fought together with Red Army and soviet partisans.
First of all they never signed any treaties with that anti-German coalition.
Besides you contradicts yourselfas in the next sentence you admit that OUN-UPA fought against Germans.
Soviet partisans units in Ukraine (whose official headquarters were in Moscow) were ordered to attack UPA first as soon as Soviet leaders in Moscow started to receive plenty of reports about collaboration of Soviet partisan units with UPA or their open recognition of nationalistic ideology and the nationalistic leadership and the denial of communism