We never had any NATO fighter in our inventory, except we have bought few jet engines from them.
In 1979 we were only partially mechanized, but today we are fully mechanized with the enhanced information technology in most of the domains.
While today's Vietnam still relies on the foreign and its military modernization still stuck in the era of the 1970-1980s with only partial mechanization, our military modernization simply doesn't belong to the same generation with you guys.
Back in 1979, our conventional weapons definitely belonged to the same generation with you guys, but with poorer quality, since you guys got both weapons from USA and USSR, while we got stuck with the 10 years cultural revolution with everything getting rusty.
But today everything is different.