Mr Sogavare, who is the prime minister of Solomon Islands, has also declared his country's support for the United Liberation Movement for West Papua's bid to be a full member of the MSG.
Mr Sogavare has just been in Port Vila where he met with his Vanuatu counterpart Charlot Salwai whose proposal to give the Liberation Movement full membership at the MSG is to be discussed at an upcoming MSG leaders summit in Papua New Guinea.
While in Vila, the MSG chair met with visiting representatives of the Liberation Movement which has strong support in Indonesia's Papua region.
Since the West Papuans were granted observer status in the MSG last year, Mr Sogavare said the situation in Indonesia's Papua region had become more tense, leaving the indigenous people on the "brink of extinction".
This comes after Indonesia's leading human rights organisation said that since the new government came to power in late 2014, abuses in Papua were as rampant as they were under previous governments.
Crossing the line
Indonesia was granted MSG associate member status last year in a bid to foster dialogue with Jakarta on West Papua.
However, in a statement, Mr Sogavare censured Jakarta for rebuffing his his request for dialogue on Papua.
"Indonesia has crossed the line so we need to take some tough stance," he said.
A recent surge in Indonesian diplomatic overtures to Pacific Islands countries is increasingly seen as being about countering the growing regional support for West Papuan self-determination aspirations.
However Melanesian leaders are frustrated at Jakarta's apparent aversion to meaningful dialogue about West Papua.
The Indonesian President Joko Widodo's refusal to meet with Mr Sogavare in his capacity as the MSG chair has been proffered as grounds for the Melanesian states to "take the matter up to the next notch which is the United Nations".
Mr Sogavare said as well as the membership bid, the MSG summit would address the group's pursuit of UN action on what he called "genocides committed against humanity in West Papua by Indonesia".
While Solomon Islands, Vanuatu and New Caledonia's Kanaks have signalled support for West Papua's membership bid, it remains uncertain where the other two full MSG members - Fiji and PNG - stand.
Governments of both countries have closer ties with Indonesia than the others, and Jakarta has recently said that it has support of the Fiji and PNG for its own bid for full MSG membership.
Vanuatu appeared to counter that when prime minister Salwai suggested Indonesia should be stripped of its membership status within the MSG.
The West Papua issue continues to be a stern test of MSG unity.