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The widespread demoralisation of the Russian forces in the area and a successful offensive to re-take Grozny by Chechen rebel 's forces led by Aslan Maskhadov prompted Russian President Boris Yeltsin to declare a ceasefire in 1996 , and sign a peace treaty a year later that saw a withdrawal of Russian forces .
 Grozny, Aslan Maskhadov, Boris Yeltsin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Grozny, Aslan Maskhadov, Boris Yeltsin