Poland refused to budge Friday from its demands for extra air defence-type security guarantees from the United States in exchange for agreeing to host elements of a US missile shield.

"The installation of the missile shield would create new dangers and if the shield cannot counter all these dangers, we need other technological elements, like for example Patriot missiles, on Polish soil," Prime Minister Donald Tusk told reporters.

"We don't expect extraordinary funding, we're not talking about great sums of money, but we need clear solutions, to know there is a permanent arms presence guaranteeing Poland's security," the prime minister said.

Warsaw has been lobbying Washington to provide it with a THAAD or Patriot-type air defence system in exchange for agreeing to the missile shield project.

"We can agree anytime, tomorrow, in a week, in a month as long as we have real guarantees for our security," he said. "In my opinion, the negotiations are continuing."

"We don't have the intention of speeding-up or slowing down the negotiations -- we are ready to cooperate but we are waiting for an answer from the American side," Tusk said.

Tusk's statement came after a whirlwind of top-level consultations that were prompted by a telephone call Thursday with US Vice President Dick Cheney.

It also followed conflicting statements from Warsaw and Washington regarding the status of bilateral talks on striking a deal over the deployment of US interceptor missiles in Poland.

Polish media said this week that Tusk's government was not satisfied with proposals Washington made in the latest round of talks.

The conversation between Tusk and Cheney took place after a senior US State Department official who asked not to be named told AFP that a "tentative agreement" had been reached following the two days of talks.

But Polish Defence Minister Bogdan Klich said no accord had been struck.

The United States wants to base 10 interceptor missiles in Poland and a radar facility in the neighbouring Czech Republic by 2011-13 to ward off potential attacks by so-called "rogue" states, notably Iran.

A deal under which the Czech Republic would house the radar base was concluded in April.

Russia is opposed to having the US missile shield on its doorstep, and public opinion in the Czech Republic and Poland is broadly opposed to the system.

NATO endorsed the US plan at its April summit in the Romanian capital Bucharest.