What UN approval?
Russia agreed to withdraw its 14th Army from Moldovan territory in an agreement signed 21 October 1994 and acknowledged in the December Budapest declaration of the Conference on Security and Co-operation in Europe.
On 7 April 2016, Russia announced it would withdraw its troops from Moldova once the problem of liquidating the 14th Army's armament depots was solved.
On 22 June 2018, UN General Assembly adopted resolution (document A/72/L.58), which urged the Russian Federation to unconditionally withdraw its troops and armaments without delay from the territory of the Republic of Moldova.
To this day, Moldova continues requesting the withdrawal of the Russian troops from Transnistria, having done so as recently as in 2021
You seem to have skipped one (likely on purpose):
https://en.wikipedia.org/wiki/Joint_Control_Commission
By the way, the General Assembly’s votes are NOT binding (but then you knew that too).