BRUSSELS  - The European Union is making swift progress on adopting much tougher economic sector sanctions against Russia for its role in the Ukraine crisis, officials said Friday.

After discussions on broadening the sanctions from the current mix of asset freezes and travel bans, legislative proposals required to give effect to the new punitive measures will be taken up Tuesday, they said. The European Commission, the EU’s executive arm, “will swiftly table the necessary legislative proposals in all areas identified” by member states earlier this week, a statement said.

The EU has been reluctant to adopt the tougher economic sector measures backed by Washington but the alleged shooting down of Malaysia Airlines flight MH17 by pro-Moscow rebels in eastern Ukraine with a Russian-made missile has forced a clear change in thinking, although divisions clearly remain.

Citing the MH17 disaster and continued Russian support for the rebels, EU foreign ministers agreed on Tuesday the Commission and the bloc’s external affairs arm should finalise work on tougher, sectoral measures. They should “present proposals for taking action, including on access to capital markets, defence, dual-use goods and sensitive technologies, including in the energy sector.”

Implementing such broader measures will need approval by all 28 EU leaders and a Commission spokeswoman said this was unlikely before Tuesday, when the legislative proposals will be tabled.

Meanwhile, Ukraine sought Friday to avoid a political crisis after the shock resignation of its prime minister, as fighting between the army and rebels close to the Malaysian airliner crash site claimed over a dozen more lives. President Petro Poroshenko called on parliament to heed “cold reason” and pass a vote of confidence in the government, a day after premier Arseniy Yatsenyuk walked out in fury over the collapse of his ruling coalition.

Yatsenyuk’s resignation piles on more woes for a country already struggling to cope with a chaotic situation in the rebel-controlled east, where international experts are carrying out a complex investigation into last week’s downing of Malaysia Airlines flight MH17 that left 298 dead.

The grave challenges facing the country - where the UN said 230,000 people have fled fighting - go beyond its borders, as Washington accused Russian troops of firing artillery across the border on Ukrainian forces.

The United States has already accused Moscow of supplying the missile system which it believes was used by pro-Russian separatists in east Ukraine to shoot down MH17. It said late Thursday it had evidence that Russia was planning to “deliver heavier and more powerful multiple rocket launchers” to the rebels.

Both Moscow and the rebels deny having anything to do with the shooting down of the passenger airliner and have both promised to cooperate with an international probe into the disaster.

A truce has been declared in the vicinity of the vast crash site in rebel-held Grabove, where experts say some remains of the victims still lay decomposing under the sweltering summer heat more than a week after the tragedy.

Dutch authorities have said they are only sure that about 200 of the bodies have been recovered from the scene, as two more planes carrying 74 more coffins left Ukraine for the Netherlands.

To secure the debris scene, the Netherlands, which is leading the probe after losing 193 citizens in the crash, said it was sending 40 police to the site.

Australia, which lost 28 citizens in the crash, said it already has 90 police in Europe ready to deploy and that it also plans to send troops.

“This is a humanitarian mission with a clear and simple objective, to bring them home,” Prime Minister Tony Abbott said. “All we want to do is to claim our dead and to bring them home.”

The government’s offensive to regain control of Ukraine’s eastern industrial heartland was given a boost Friday when its forces took the strategically-important city of Lysychansk.

At the same time, it reported losing 13 soldiers in the past 24 hours, while local authorities in the region of rebel strongholds of Donetsk and Lugansk said 16 people have been killed.

The bloody insurgency has forced 230,000 people to flee their homes, the United Nations said, including 130,000 who have sought refuge in Russia.

While the civil war rages on in the east, politicians in Kiev were locked in a fierce debate over Yatsenyuk’s abrupt resignation, with the UDAR (Punch) party of boxing champion Vitali Klitschko insisting that the premier stay on until early parliamentary elections are held.

Together with a few other parties, UDAR announced Thursday it was exiting the governing coalition - a move that sparked Yatsenyuk’s resignation and triggered the possible announcement of new legislative polls expected this fall.

The Fatherland faction of ex-prime minister Yulia Tymoshenko condemned the coalition’s collapse, saying it “opens up a second front” in the country as it battles to quell the insurgency in the east.

“Between peace and chaos, Ukraine unfortunately is choosing political chaos,” said the party in a statement read out by one of its lawmakers in parliament.