The CPI(M) today said the Opposition will "fully support" the Centre in its efforts to resolve the India-China standoff in Doklam area through diplomatic channels.
Yechury, however, asked the government to reflect and introspect why "suddenly" India's neighbourly ties in the region have "deteriorated".
The Marxist leader sought to know why the intelligence inputs available before the attack on Amarnath pilgrims "was not used" and how the bus carrying pilgrims was allowed to go off on its own, as he demanded accountability for the "lapse" be enforced immediately.
In his Facebook post after the meeting, Yechury also claimed that the government had no answers when the opposition expressed "puzzlement" as to why no terror group took responsibility for the attack.
"The government briefed us on the stand-off with China and said that efforts are on to resolve this through diplomatic channels and talks.
"We fully support the government in these efforts. We are for peace and tranquillity with all our neighbours. This is in India's supreme interest," he said in the post.
Yechury reiterated the opposition's position that the situation in Jammu and Kashmir has "worsened" in the past three years and asked the government to correct its "faulty" approach.
He also accused the government of going back on its promises made to the people of Jammu and Kashmir and the rest of India that "it shall implement confidence-building measures and start the political process with all stakeholders".
"The government must answer," he stressed.
The Rajya Sabha member also said that the "growing" instances of lynchings and attacks on minorities and Dalits are also adding to the view that the deteriorating internal security environment in the country is a "matter of grave concern".
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)