BRUSSELS, Dec. 12 - Dutch Prime Minister Mark Rutte will ask European Union leaders on Thursday to rule out Ukraine joining the bloc for now and to place clear limits on the rewards they offer Kiev under a landmark cooperation agreement, diplomatic sources told Reuters.

Failure to meet the Dutch demands would jeopardize the agreement, which establishes closer political ties and envisages a gradual freeing-up of trade to bind Ukraine closer to western Europe and draw it away from Russia's orbit.

Rutte is trying to free himself from a political bind after Dutch voters, concerned about the costs, rejected the so-called association agreement in a referendum in April. If his demands are met, he plans to go back to his parliament to win an endorsement that would overwrite the negative vote.

The Dutch are therefore seeking a legally binding decision by the 28 EU leaders that the association agreement is "not a stepping stone" to EU membership for Kiev, one source said. This is not to the liking of Poland, a key supporter of Ukraine.

"For us it is hard to accept. If it were not to lead to membership at some point in the future, then why bother with all that?" Polish Foreign Minister Witold Waszczykowski told reporters.

"For now of course the prospect of Ukraine's membership is quite distant. But one day, after Ukraine implements all the provisions of the association (and) introduces all the EU recommendations, we will return to this issue."

A draft document for the EU leaders to approve, prepared by the Dutch and seen by Reuters, also rules out financial or security guarantees for Ukraine and spells out that Ukrainians are not being given the right to live and work in the bloc.

"The stakes are high," one diplomat said. "At the end of the day, if the association agreement is not ratified by the Dutch, it will be a defeat for Ukraine, a defeat for the EU and a victory for Russia."

Another diplomat said: "It's expensive but worth it. At this stage, it's either this or nothing."

For that reason, diplomats expect a deal, even if some governments - especially Ukraine's close allies in eastern Europe - are concerned and irritated by the Dutch demands. EU ambassadors were discussing the issue further on Monday in Brussels.

The draft Dutch document says the Ukraine association agreement "does not contain an obligation for the Union or its member states to provide collective security guarantees or other military aid or assistance to Ukraine", and nor does it require additional EU financial support. (rt/ez)