Incoming arms and parts.
Does the Ukraine sell arms and technical machines and knowledge to Iran?
It was caught selling strategic cruise missiles to China and Iran under Yuschenko presidency. The ‘pro-American’ president approved the shipment himself and then lied about it and intermediaries all died in ‘unrelated’ car crashes. They are suspected of selling ICBM technology to North Korea under Poroshenko although there are only circumstantial evidence to it.
They generally tend to do business with rogue entities everyone else tries to avoid.