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Ukraine Prime Minister Arseniy Yatsenyuk Sergii Kharchenko | Pacific Press | Getty Images Ukraine's prime minister said on Saturday Russian President Vladimir Putin aimed to destroy

Ukraine as an independent country and said only NATO could defend the ex-Soviet republic from external aggression. Kiev and its Western backers accuse Moscow of sending troops and tanks into

eastern Ukraine in support of pro-Russian separatists battling Ukrainian forces in a conflict that has killed more than 3,000 people. Russia denies the accusations. A fragile ceasefire

negotiated by envoys from Ukraine, Russia, the separatists and Europe's OSCE security watchdog, has been in place in eastern Ukraine for more than a week and is broadly holding despite

sporadic violations. "We are still in a stage of war and the key aggressor is the Russian\ Federation ... Putin wants another frozen conflict (in eastern Ukraine)," Prime Minister

Arseny Yatseniuk told a conference attended by European and Ukrainian lawmakers and business leaders. Yatseniuk said Putin would not be content only with Crimea - annexed by Moscow in March

- and with Ukraine's mainly Russian-speaking eastern region. Read MoreUS expands sanctions to Russia's biggest bank "His goal is to take all of Ukraine ... Russia is a threat

to the global order and to the security of the whole of Europe," said Yatseniuk, who is known for his hawkish rhetoric. Asked about future NATO membership, a red line for Russia,

Yatseniuk said he realized the alliance was not ready now to admit Kiev, but added: "NATO in these particular circumstances is the only vehicle to protect Ukraine." There is no

prospect of the Atlantic alliance admitting Ukraine, a sprawling country of 45 million people between central Europe and Russia, but Kiev has stepped up cooperation with NATO in a range of

areas and has pressed member states to sell it weapons to help defeat the separatists. RUSSIA 'BLUFFING' OVER SANCTIONS Read MoreRussia Deputy PM: Sanctions not good for anybody

Yatseniuk also praised a new wave of economic sanctions imposed on Russia by the European Union and the United States and said they posed a major threat to the Russian economy. "It is

bluff (by Russia) to say it does not care about the sanctions," he said, noting that Russia relied heavily on its energy sector and some of the sanctions target its oil firms. Western

powers imposed new sanctions on Friday, tightening financial measures against Moscow in a move Putin called "a bit strange" in view of the ceasefire. Yatseniuk defended his

government's efforts, despite the conflict, to tackle rampant corruption and overhaul the creaking economy, adding: "It is very hard to attract investors when you have Russian

tanks and artillery in your country." Yatseniuk, whose centre-right People's Front party is expected to do well in a parliamentary election on Oct. 26, praised a decision on Friday

to delay the implementation of a new trade pact with the European Union until the end of 2015. Read More Some have seen the decision to postpone the implementation of the deal as a

diplomatic victory for Russia, which is opposed to closer economic ties between Kiev and the EU, but Yatseniuk said it would be good for Ukraine's own economy. "We got a grace

period. The EU opened its markets but Ukraine is still protected, so for Ukraine this is not a bad deal," he said.