KIEV, Sept. 16 - Ukrainian lawmakers on Tuesday ratified a landmark EU pact and adopted laws granting self-rule to the east in crucial votes that will shape the future of the splintered former Soviet state, AFP reported.

But Russia signaled it had no intention of backing down in the most serious East-West standoff since the Cold War, announcing it plans to boost its troop presence in annexed Crimea.

The European and Ukrainian parliaments held simultaneous votes to approve the political and economic association agreement whose rejection by the former government triggered the country's worst crisis since independence in 1991.

Lawmakers in Kiev also voted to grant self-rule in eastern regions under the control of pro-Russian rebels and offer amnesty to fighters under a peace plan drawn up 11 days ago to halt the bloody five-month conflict.

Insurgent leaders reacted cautiously to the moves, although they insist they want nothing less than full independence.

President Petro Poroshenko said the adoption of the 1,200-page EU deal was Ukraine's first step towards membership of the 28-nation bloc.

The pact underscores Ukraine's strong westward push just as Poroshenko heads to Washington for crunch talks with US President Barack Obama on Thursday.

"Tell me, who will now dare to shut Ukraine's doors to Europe?" Poroshenko said before the unanimous vote by all 355 MPs present.

EU leaders hailed it as a "blueprint for Ukraine's transformation into a modern and prosperous European democracy".

Washington also praised the pact, with State Department deputy spokeswoman Marie Harf saying Ukraine had made history "in the face of great challenges".

But the historic occasion was muted by a decision to delay until 2016 the implementation of a free trade deal, an apparent concession to the Kremlin.

Andrei Purgin, deputy prime minister of the self-proclaimed Donetsk People's Republic, responded by saying bluntly that Donbass "no longer has anything to do with Ukraine".

But he also said the rebels would "carefully study" the legislation, describing it as a "positive signal because it marks Kiev's return to reality".

The legislation calls for December polls in Donetsk and Luhansk and allows local legislatures to set up their own police forces and name judges and prosecutors.

Crucially, it also guarantees the right for Russian to be used in all state institutions -- a particularly sensitive issue in the mainly Russian-speaking regions.

Another law also grants amnesty to both the insurgents and Ukrainian government forces over their actions during the conflict, although rights groups have alleged abuses by both sides that could be considered war crimes.

Washington said the amnesty and the special status accorded to Donbass underscored Kiev's "continuing commitment to resolve the ongoing conflict in eastern Ukraine peacefully."

Outside parliament on Tuesday, riot police fired tear gas on about 200 demonstrators demanding the adoption of a law aimed at purging government officials accused of corruption or links to the old pro-Kremlin regime.
The law passed on the third reading. (afp/ez)