More than 51,000 households were left without gas and 1,500 apartment buildings had no winter heat in Moldova's Moscow-backed separatist enclave, authorities said on Monday, as Moldova and Russia traded blame for an escalating energy crisis.

The head of Moldova’s breakaway region Transnistria has urged residents to burn firewood for heating and warned that blackouts cannot be avoided, after Moscow stopped supplying gas via Ukraine.

"Russia is revealing the inevitable outcome for all its allies — betrayal and isolation," Moldovan Prime Minister Dorin Recean said on Jan. 3.

The move was connected with, but not required by, the expiration at the end of 2024 of Russia’s contract with Ukraine for transit of natural gas to Europe. The looming energy crisis is likely to have a strong negative effect on Moldova’s ruling pro-European Party of Action and Solidarity (PAS) in parliamentary elections due in the second half of 2025.

Moldova faces a security crisis, Prime Minister Dorin Recean said on Friday after its separatist pro-Moscow Transdniestria region, cut off from supplies of Russian gas, closed factories, restricted central heating and imposed rolling power blackouts.

An energy crisis in Transnistria, a pro-Russian territory between Moldova and Ukraine, erupted on Jan. 1 when Moscow stopped supplying natural gas through a pipeline running across Ukraine.

Moscow breakaway region of Transnistria halted almost all industrial activity except for food production, following the end of Russian gas flows through Ukraine, Interfax reported.

Moldova has accused Russia of triggering an energy crisis after tens of thousands of homes in its eastern breakaway region of Transnistria were left without heating, gas or electricity following the end of a Ukraine gas transit agreement last week.