Exhausted Ukrainian soldiers need more troops on the front line, not just more artillery, says former US general

• Ukraine was boosted in its war against Russia by a new US aid bill last week. 
• But it faces serious manpower shortages, ex-US general Mark Hertling told CNN. 
• "Ukraine needs the mobilization of more soldiers," Hertling told CNN. 

Ukraine got a much-needed boost in its war against Russia when a long-delayed $61 billion aid package was passed by the US Congress last week.