The presence of 1,000 Russian soldiers in eastern Ukraine ā€œis a game-changerā€ in the months-long conflict with Russian-backed separatists, says one analyst, but it remains unlikely that the international community will be dragged into a full-scale war.

Russian tanks began rolling into eastern Ukraine last week, according to satellite images released by NATO, and the organization confirmed the soldiersā€™ presence on Thursday.

The move means ā€œbluntly drawing Ukraine and the entire world into a full-scale war,ā€ Ukrainian President Petro Poroshenko said.

Russiaā€™s military exercises in eastern Ukraine are ā€œa massive escalationā€ in its operations in that country, says University of Toronto political science professor Randall Hansen, efforts that had been focused on arming pro-Russian rebels and supporting separatist activity.

ā€œThis is an invasion,ā€ Hansen told CTVā€™s Canada AM on Friday. ā€œThis is a game-changer, thereā€™s no question about that.ā€

But is it enough to spur the international community to declare all-out war with Russia to protect Ukrainian sovereignty?

Word of the escalation sparked an international outcry, with Foreign Affairs Minister John Baird suggesting on Thursday that Russia was ā€œstarting to turn up the speedā€ on what appeared at first to be a ā€œslow-motion invasionā€ of Ukraine.

Baird urged Putin to rein in his troops, and said Canada will consider further sanctions against Russian nationals. He did not elaborate.

NATO has organized air sorties over neighbouring countries such as Latvia and Lithuania, as a show of solidarity with Ukraine. However, Ukraine is not a NATO member, and so its efforts will remain limited, Hansen said.

ā€œOf course NATO isnā€™t going to go to war over Ukraine,ā€ he said.

Ukrainian Prime Minister Arseny Yatseniuk said Friday that Ukraine will start making the necessary moves to apply for full NATO member status, a decision that NATO Secretary General Anders Fogh Rasmussen said has his full support.

The international community will consider what ā€œso far has been unthinkable,ā€ and that is whether to provide arms and training to Ukrainian soldiers, Hansen said.

Ukraineā€™s ambassador to Canada, Vadym Prystaiko, said Thursday that Ukraine needs arms from its allies, as Russia has armed the rebels.

ā€œRussia is not shying away from helping separatists with everything they have: anti-aircraft missiles, tanks, everything,ā€ Prystaiko told Ā鶹“«Ć½ Channel on Thursday. ā€œSo far we are not receiving any military assistance.ā€

Some allies have provided helmets and other ā€œsimple stuff,ā€ he said, but ā€œwe need something to fight troops with. Real ammunition, real tanks and aircraft.ā€

None of Ukraineā€™s allies has stepped up with promises of military aid. However, NATO has floated the idea of rotating bases in the region with a small number of soldiers.

That type of promise however, is ā€œmore about drawing a line around Eastern Europe, reassuring the Baltic states, Poland, countries which for historical reasons are extremely worried,ā€ Hansen said Friday.

ā€œWill that make a difference with Putin? I rather doubt it. Much depends on how Ukraine can respond, and how we can help Ukraine respond, and that comes back to the very difficult issue of actually arming Ukraine and training Ukrainian soldiers.ā€