The Siberian tiger, Ilona, was observed at a location less than five kilometres from the Heilongjiang River along the Sino-Russian border, Eugene Simonov, coordinator with Rivers without Boundaries Coalition, a multinational non-governmental organisation told state-run Xinhua news agency.
Simonov said he received a message from Russia yesterday morning and the tiger, tagged with a tracking device, was found moving toward China over the previous three days.
China launched a massive hunt for it in the forests.
Chen Zhigang, director of the nature reserve, said yesterday that personnel had been dispatched to remove traps and set up more than 60 cameras in the hope of capturing the tiger's image.
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Simonov said parties in the region should have a contingency plan as soon as possible in case the tiger is trapped.
Fewer than 500 Siberian tigers remain in the wild, mainly in eastern Russia, northeast China and northern parts of the Korean Peninsula.
Simonov and zoologists have called for establishing a nature reserve on the Sino-Russian border to prevent inbreeding among the endangered species.
"We have been talking about the cross-border nature reserve for years. It would be highly conducive to the protection of Siberian tigers," Simonov said.
Wildlife expert Ma Jianzhang, who is also an academician with the Chinese Academy of Engineering, said it was not uncommon for wild Siberian tigers to cross the border.
"Most tigers settle in Russia, and some come to China for food because competition here is not that fierce." Ma said.