"These statements [by Russia about invading to orotect oppressed Russian speakers in Transdnistria] are unfounded and contradict the position of the Russian Federation supporting the sovereignty and territorial integrity of the republic of Moldova ... During the meeting, it was reiterated that the republic of Moldova ... is a neutral state and this principle must be respected by all international actors, including the Russian Federation."
-website
They can claim neutrality all they wish, but Putin doesn't care. If they wish to retain their sovereignty, their only hope is to join Ukraine in defending themselves.