Vietnamese Ambassador to India Ton Sinh Thanh said the situation in the South China Sea region was "getting worse" with militarisation.
"We expect that Prime Minister Modi's visit will be soon. It will open a new page in bilateral relationship. We hope the visit will upgrade ties to a more comprehensive level. Preparation for the visit is going on," he said during a media interaction at the Foreign Correspondents Club here.
The visit will be the first by an Indian PM in the last 15 years.
The envoy reminded that the two countries were gearing up to celebrate milestones in the form of 25th anniversary of diplomatic relations and 10 years of the establishment of strategic partnership.
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Thanh said Vietnam "appreciates" India's position on the Permanent Court of Arbitration ruling whereby it "recognises" the international court as well as the UN Convention on Law of Seas (UNCLOS).
Stressing that Vietnam deplores "militarisation", the envoy said the court ruling, which holds the potential to reduce the area of dispute, needs to be complied with.
"The situation in South China Sea is getting worse with militarisation and so the ruling is welcome. The situation is not stable and territorial issues have not been settled yet," Thanh, the country's ambassador to India since 2014, said.
Asked whether Brahmos would be on the table during Modi's visit, Thanh said while Vietnam appreciates India's "achievements" in the defence sector, "whatever we buy is for self-defence".
He said Vietnam, which will host the APEC (Asia-Pacific Economic Cooperation) summit next year, would welcome India's membership in the grouping provided there was a consensus to lift the moratorium imposed on any such new joining.
Thanh added that Vietnam was trying to manage good relations with both India and China and that mutual ties between any two countries should not be seen as "against" a third country.