Under the deal, which was due to be signed today, Russian energy giant Gazprom will acquire a 50 percent stake in Belarus's gas pipeline monopoly, Beltranshaz.
Belarus's government spokesman Alyaksandr Tsimashenka said negotiations are continuing.
Gazprom spokesman Sergei Kupriyanov downplayed the last-minute delay, saying the deal would be signed by June 1.
(AFP, BelaPAN)
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