That “color revolution” was the Orange Revolution of 2004 - 2005, rather before Obama’s presidency. And I wouldn’t try to blame the ouster of Yanukovych on him either. Ukrainians are fed up with corruption, of which Yanukovych was an exemplar.
Sorry of it offends, but the United States under Obama simply replaced Russia and Putin as the corrupt enabler of oligarchs ruling Ukraine. Nothing what occurred after Nuland said “Yats is our guy” and made him interim President, to Biden strong-arming another of “our guys” Poroshenko to fire Shokin makes me thing any different.