Vietnam has moved to bolster the stability of the Communist Party's grip on power by naming more security chiefs on a Politburo embarking on continued, but more cautious, reform. Hanoi's septuagenarian ruling troika of General Secretary Do Muoi, President Le Duc Anh and premier Vo Van Kiet were confirmed to remain on an otherwise younger, larger 19-member Politburo at the end of the first party congress in five years. Six members are from the influential military or secretive Interior Ministry - three of whom have been appointed to a new five-man internal elite that appears to concentrate power at the top. 'We can only have economic development with social and political stability,' Foreign Minister Nguyen Manh Cam, also a Politburo member, said when asked about the new security presence. 'If we want to have stability, we need to ensure our security,' he said soon after the four-day congress ended. The military expansion is understood to have followed months of internal debate and is headed by President Anh - a former top general - and military political supremo Le Kha Phieu, who has moved up to No 5 on the body, the most powerful institution in the country. The move matches a definite tone of caution about the way ahead after 10 years of reform that has brought unprecedented growth to a long-isolated society. The congress rubber-stamped documents calling for continued but controlled social and economic reforms, including a continued role for foreign investors as leaders inch towards financial liberalisation. Few details have emerged specifying how the party can beat graft, improve laws and attract more foreign capital, but the documents outline wide plans for more 'combative' party and state control of the economy - and most aspects of everyday life. The gathering reaffirmed ambitious goals including annual economic growth of nine to 10 per cent, the creation of a fully industrialised nation within 25 years and the eradication of hunger by 2000. Party chief Do Muoi called for 'clean, transparent' cadres while warning against 'hostile forces'. 'If anybody wants to attack this party, they will be in big trouble,' he said. Asked how long the party would remain in power, he replied: 'For ever.' Mr Muoi, 79, has called for young blood but left his own future open. Party sources suggest the top three will step down within two years. But they have apparently strengthened their positions by creating a Chinese-style 'standing body' executive. In a surprise move as General Anh wrapped up final voting of resolutions, Ho Chi Minh City delegate Hai Tan claimed the new body had too much power written into the party statues. But just as Mr Tan appeared to be dissenting - something virtually unheard of in public in Vietnam - he suggested a motion that wiped all references to the body from the party books. The move effectively isolates its operation within the Politburo, taking it away from the watch of the 170-member central committee. The move was swiftly voted in, with agreement from all top leaders. Mr Cam said the Politburo had yet to define its role, but denied it represented any powerful elite, insisting it would merely concentrate on 'day-to-day' matters.