"Despite pressure from the president, I will not allow any conflict over the Black Sea Fleet," Tymoshenko told reporters.
Yushchenko announced earlier this year that Ukraine would not extend the lease of the Russian naval base in Sevastopol beyond 2017.
Tymoshenko said that by opposing Russia, Yushchenko was trying to win over Ukrainian voters in the run up to presidential elections slated for the end of 2009.
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