The Ukraine is a corrupt deadbeat nation, and has been since it’s referendum to secede from the Soviet Union.
It was impossible for any Ukrainian to to participate in the money laundering of the natural gas revenues without Putin, Medvedev, and the other Russian oligarchs setting up and maintaining the covert scheme. This is also why Yeltsin, Putin, and the Russian organized crime groups helped to put ethnic Russians in the Ukraine like Yanukovych in control of the Ukraine and established the Ukraine's natural gas industry as a monopoly under their criminal organization's control. The ordinary people of the Ukraine had little or no control over what Putin and his Ukrainian accomplices were doing to the Ukrainian industry. So, when you criticize the Ukrainian natural gas industry, you are in effect criticizing the Russian control of the Ukrainian natural gas industry.
Now that the Ukrainians are putting a stop to the Russian criminal looting of the Ukrainian natural gas industry, Putin wants to invade the Ukraine and simply steal it from the Ukrainian people.