Gao Yang wasn't exaggerating; he now has enough resources to elevate Shava into power.
Money-wise, Gao Yang now has more than 200 million on hand. Andre left around 150 million, he brought back 80 million in cash when he returned from the Skull Gang, plus another 20 million was cleared by scraping the bottom of the barrel.
More importantly, Gao Yang now doesn't lack connections. Cultivating a gang using Grand Ivan's network in Ukraine is as easy as can be. It's simply a matter of Gao Yang saying the word, and Shava can do anything with the green light all the way.
Of course, Gao Yang's support for Shava's rise has a bit of mixing personal gain with public interest, using Grand Ivan's power to bolster his own people. However, after everything Gao Yang has done to help Grand Ivan, risking his head to safeguard Ivan's legacy without even seeing him face to face, doing this much doesn't seem overboard, right?