They support Russia because the Kiev regime has been trying to genocide them for the last nine years! After the coup against the president that the Russian speaking areas voted for the new coup government immediately banned Russian as an official language. They made it illegal to teach it in schools! They attacked and persecuted people across the Russian speaking area, especially the Donbass. For instance in Mariupol, Kiev sent the overtly fascist Azov battalion to attack and break up a march in celebration of the 69th anniversary of the Soviet victory in WW2, using APCs and live ammunition. Now why would they attack on Victory Day, the day of symbolic victory over the Nazis? The officers of the Mariupol police station refused to go out and beat up marchers, so they were quietly murdered. Here are the events depicted even by western empire media, back before they'd had the 'Slava Ukraini' chip installed.

As for the early days of the war, here I go posting it again: