After the collapse of the Soviet Union, why did Kazakhstan and Ukraine have completely different fates?

Kazakhstan is located in a remote location and has a backward economy. During the Soviet period, it was a younger brother who had to follow closely. After the disintegration, Kazakhstan honestly joined the Russian Federation, and honestly stood in line to participate in the Shanghai Five, without being in the limelight. Causing big trouble - Of course, the current domestic situation is also very average, at a passable level.

Ukraine is in a critical position. Its economy was once among the best among the Soviet allies. Its relationship with the Soviet Central Committee was full of twists and turns. It was the most joyous after the disintegration. However, no matter how rich the capital was, it could not withstand the war for decades. After years of turmoil, the last ten years have even seen a civil war. With Ukraine’s low political level, which cannot handle domestic politics well, it still has to be so mean-spirited in order to gain advantage in the competition between the three parties of Russia, the United States and Europe, it is doomed that it will always be looking for trouble. The fate of the country with a swollen face.