Belarus has threatened to cut the supply of electricity via its territory to the Russian enclave of Kaliningrad.
The Belarus state power firm Belenergo said Russia was delivering electricity to the enclave in the absence of an agreement on transit fees.
"This compels the Belarusian side to think of cutting the unauthorised commercial transit of electricity," the Belenergo statement said on Monday.
A dispute over Russian oil supplies to Belarus has not yet been resolved.
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Belarus warns Russia of power cut