"Presidential polls have been called by the illegitimate authorities and therefore they are illegitimate," Denis Pushilin, one of the leaders of the self-declared Donetsk Republic, told reporters in Moscow.
"We are not planning to participate in the elections of our neighbours," the 32-year-old said, referring to a snap presidential election scheduled to take place in Ukraine on May 25.
"They are unlikely to take place in the Donetsk region," said Pushilin.
He said Russia could provide support by covering the situation in the rebel-held region and providing consultations.
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"Ukraine is on the verge of the toughest social and economic crisis," he said. "We are waiting for humanitarian aid," he added, noting he would like to meet Moscow officials on a later visit to Russia.
"Because after the referendum, after legalisation there will be a different conversation."
Russia has not endorsed the self-declared authorities in the impoverished, coal-mining Donetsk region but has stressed that Kiev has to respect the legitimate aspirations of Ukraine's Russian speakers.
"Of course they are there," he said. "This is a Russian land. And I don't see any possibility to stop them or work against them. This would not be right.