The remarks by senior Samajwadi Party or SP leader Ram Gopal Yadav came after Modi raised the issue of Chinese incursions with the visiting Chinese President Xi Jinping.
"The Samajwadi Party's policy is very clear that we cannot trust China. Days after Chinese leader Zhou Enlai was welcomed in New Delhi where people raised slogans of 'Hindi Cheeni bhai-bhai', Chinese aggression took place in 1962.... Recently, when a Chinese leader was visiting India, Beijing remarked that Arunachal Pradesh was part of its territory," he told reporters in Delhi.
Yadav, who is also the National Spokesperson of the Mulayam Singh Yadav-led party, said China feels that India comes under pressure and fails to retaliate.
"We demand that Prime Minister Modi should respond (to Chinese aggression) in the same language. Till the time, we do not use force, aggressions will continue," he said.
SP Chief Mulayam Singh has often attacked "Chinese designs", saying India will have to assert itself.
The Chinese Army has reportedly made a fresh incursion in Chumar area in Jammu and Kashmir and refused to return.
Heightening tension, the Chinese Army pushed in more troops into Chumar village in the wee hours today, ahead of the Summit meeting between Chinese President Xi Jinping and Prime Minister Narendra Modi.