Ukraine's Western-backed leader Petro Poroshenko has promised to meet Russia's Vladimir Putin and involve US President Barack Obama in his stalled push for peace with pro-Kremlin fighters in the separatist east. The surprise announcement on Monday came days after the first direct peace talks with the rebels in three months broke down after just one hostile round. Poroshenko is waging a two-front campaign to save the former Soviet Union's second largest republic from disintegration and economic collapse. His bid to fend off bankruptcy was boosted on Monday by parliament's passage of an austerity budget that eases the tax burden on small firms and should help unlock delayed loans from the International Monetary Fund. His efforts to resolve the eight-month war that has brought Ukraine to economic ruin will see him meet Putin for the first time since the two briefly shook hands at an October summit in Milan. Poroshenko said his January 15 talks with Putin would also involve German Chancellor Angela Merkel and French President Francois Hollande. Washington has let Merkel lead in prompting Putin to adopt a more conciliatory approach to Ukraine's pro-Western aspirations and to rein in the rebel militias. But Poroshenko made it clear on Monday that he wants the White House more involved. "We are anticipating a return to the Geneva format that includes US President Barack Obama, with whom I discussed this issue, and the new EU leaders - Jean-Claude Juncker and Donald Tusk," Poroshenko said. There was no immediate response to his comments from Washington and Brussels. Last week's meeting with insurgents in the Belarussian capital Minsk was meant to bring into effect a September 5 ceasefire and political settlement plan that never took hold. Some 1,300 people have died since that plan was signed, bringing the toll to more than 4,700 - a figure UN officials fear is too conservative. But Poroshenko's hopes of getting a new comprehensive agreement signed in Minsk last Friday ended in failure after rebels tried to win new financial and land concessions. "Ukraine will never … allow the [original September] Minsk agreements to altered," Poroshenko insisted on Monday. As talks stuttered, fighting resumed around the disputed airport near rebel-held Donetsk. Poroshenko has been just as firm with parliament as he tries to meet the stringent terms set by Western lenders who have seen past rescues squandered by successive Kiev governments. The disputed 2015 spending plan was rammed through by the government-led coalition after a marathon debate concluded in a 4.15 am vote. Ukraine's reserves have more than halved in the past year to less than US$10 billion - a figure dwarfed by the state's foreign debt obligations for 2015.