Vladimir Putin had purportedly warned European leaders that he could take Kiev in just a matter of two weeks if he wants to.
Putin had reportedly made his statement in a boastful manner as he spoke with European Commission president Jose Manuel Barroso during talks addressing the Ukraine crisis.
"If I want to, I can take Kiev in two weeks," were his exact words according to Italian newspaper La Repubblica.
According to the newspaper, Mr Putin's remark came after reports that Europe will impose toughened sanctions against Russia.
Mr Putin is seemingly dropping all hints alluding to a looming war.
Ukraine's defence minister Valeriy Heletey said that Kiev had been receiving threats of nuclear retaliation through a war "not seen since World War Two."
"The Russian side has threatened on several occasions across unofficial channels that, in the case of continued resistance they are ready to use a tactical nuclear weapon against us," Heletey's statement posted in his Facebook Page reads.
Speaking with young campers, Mr Putin had also been quoted thanking God as no nation had thought of unleashing a large-scale conflict with Russia. He then reminded the campers that Russia is one of the leading nuclear powers.
Meanwhile, the Australian Government advised against all travel to the eastern provinces of Donetsk and Luhansk due to highly volatile security situation and reported kidnappings. Terrorist attacks occur even during cease fire.
Armed groups had set up illegal checkpoints as they threatened, detained and at times kidnapped suspected individuals.
Journalists are instructed to observe particular caution and seek specialist security advice.
The Government highlighted its advice against travelling to Crimea as the region is not under Government control.
Even with the Australian Consulate in Kyiv, headed by an Honorary Consul, limited consular assistance is given to Australians in Ukraine.
The consulate cannot issue Australian passports but can provide Provisional Travel Documents to allow emergency travel to the nearest Australian Embassy.
The Australian Embassy in Poland is able to provide full consular assistance to Australians in Ukraine.