The CPI(M) leader blamed Yadav for the collapse of the People's Front and said that his association with him was that of a "love-hate" relationship.
"The closest relationship we have had with other leaders is Mulayalam Singh. It's a love-hate relationship. We have been with him, we have been fighting, he has been betraying. He has been going back on things," Karat said in an interview to daily Malayala Manorama.
"On the question of presidential elections, it was decided that we all will back K R Narayanan. At the last minute, he (Mulayam) backed out. The People's Front we formed collapsed because of that.
"He is a person who is very difficult to remain committed to what he says. That's our general experience. Everytime he will say yes, within a few days it will become a no or something else will be done," the outgoing CPI(M) general secretary said.
More From This Section
"You can't talk to her and get her to change her mind. I have not found this in anyone else. She is very clear in what she wants and she will stick to it. That's in a sense a difficulty. Others always will look for some common ground or some compromise," he said.
On a question comparing Mayawati with AIADMK general secretary J Jayalalithaa, Karat said the latter is different and can change her opinion or stand if it is necessary.
"If she has an opinion she may modify it or change it. You can convince her...If she thinks that it is something worthwhile. Mayawati was never open to that sort of a thing. Once she has taken a stand, she will stick to that and go ahead," Karat said.