Vladimir Putin is set to attend the G20 leaders' summit in November despite alarm over Russia's actions in Ukraine with host Australia Saturday saying it was the "emphatic" wish of member nations.

There had been question marks over whether Moscow should be invited to the high-powered forum in Brisbane with the brutal five-month conflict that has killed around 3,000 people still unresolved.

Ukrainian forces and pro-Russian militias were due Saturday to pull back their troops from a demilitarized zone created under a new peace plan agreed in marathon overnight talks.

A nine-point agreement thrashed out in the early hours of Saturday in the Belarussian capital Minsk also requires the withdrawal of all "mercenaries" from the conflict zone and an immediate end to hostilities.

Two Russian fighters entered a U.S. "air defense identification zone" two days ago and were intercepted by American F-22 jets near Alaska, military officers said Friday.

The incursion on Wednesday was followed by a second incident on Thursday involving two Russian long-range bombers, which flew into Canada's air defense identification zone (ADIZ) and were intercepted by two Canadian F-18 jets, officers said.

Lithuania, Poland and Ukraine on Friday signed an agreement to form a joint brigade intended to modernize the Ukrainian army confronting pro-Kremlin separatists in the country's east.

"This shows our deep commitment to boosting the security and defense capabilities of our region, where the situation has become dangerous," Polish President Bronislaw Komorowski said after defense ministers from the three countries inked the accord in Warsaw.

A fresh round of talks on how to find a lasting solution to five months of brutal fighting in eastern Ukraine began on Friday in the Belarussian capital Minsk.

The so-called Contact Group comprising Ukraine's former president Leonid Kuchma, Russian envoy Mikhail Zurabov, four pro-Moscow separatist leaders and OSCE representatives were seen arriving for the crucial meeting at a Minsk hotel, according to an AFP correspondent present.

Forensic experts have identified a total of 225 victims of downed Malaysia Airlines flight MH17, with 14 new names released to families, Dutch authorities said on Friday.

"Among the 14 victims, seven were Dutch and seven were of other nationalities," the justice ministry said in a statement, adding that those nationalities would not be released at the behest of their embassies.

NATO will set up regional centers in a handful of Eastern European countries, Lithuania said on Friday as top military commanders met in the Baltic state's capital.

Defense chiefs from the alliance's 28 nations are taking part in a three-day meeting in Vilnius along with NATO top commander General Philip Breedlove amid anxiety in the region over Russia's actions in Ukraine.

Warring parties in Ukraine meet on Friday to try to find a lasting solution to a brutal conflict that has killed around 3,000 people and stoked Western alarm about Russia's territorial ambitions.

The talks take place in Minsk two weeks since a fragile European-brokered ceasefire aimed at halting five months of bloodshed was agreed in the Belarussian capital with Moscow, Kiev and pro-Russian separatist leaders.

Poland will not send arms or otherwise get involved in the bloody conflict in neighboring Ukraine, its prime minister-designate Ewa Kopacz said Friday.

"We shouldn't be an active participant in this armed conflict," Kopacz told reporters, while adding that Poland would adhere to all joint EU initiatives concerning Ukraine.

Russian authorities have ordered Crimean Tatars to leave their assembly building, in a move that the leader of the ethnic minority -- which opposed Russia's annexing of Crimea from Ukraine -- called a return to Soviet oppression.

Bailiffs told the Tatars' governing body, the Mejlis, that its members had until Friday to vacate their building in Simferopol, the regional capital of Russian-annexed Crimea, activists said.