WARSAW (Xinhua) -- Poland and the United States may sign an agreement within the week on installing a U.S. anti-missile base in Poland, a senior Polish official said on Sunday.

""The negotiations are winding down and everything points to an agreement being signed -- or not -- this week,"" Zbigniew Chlebowski was quoted by Polish news agency PAP as speaking on a public-affairs radio.
Chlebowski, head of Paland's ruling Civic Platform party's parliamentary caucus and mouthpiece for Prime Minister Donald Tusk, declined to give any details, according to PAP.
Meanwhile, head of Polish President Lech Kaczynski's chancellery Anna Fotyga said over the weekend the United States wants agreement with Poland on the deployment of elements of the anti-missile shield.
""I get the impression that the U.S. administration would like to bring the talks to the final,"" she told TVN 24 TV station after returning from Washington where she met top foreign policy aides to President George W. Bush.
Talks on the shield between the United States, Poland and the Czech Republic opened at the start of last year. The United States plans to install in Poland a base of 10 interceptor rockets and a tracking radar in the Czech Republic.
In return for its agreement to install the shield, Poland wants the United States to participate in the modernization of the Polish army, mainly of its air defense.
Also The Czech Republic and the United States will sign a treaty on a U.S. radar base on the Czech soil in early July during a brief visit by U.S. Secretary of State Condoleezza Rice, the Mlada fronta Dnes daily reported last week.
""Rice should arrive in the morning on Tuesday, July 8. Then the treaty will be signed and she is to leave after a gala dinner,"" the paper quoted a government official as saying.
Russia has objected the anti-missile shield plan, saying it will threaten Russian national security, and has warned that Moscow will target its missiles at the system if it is deployed in Poland and the Czech Republic.
Russia's foreign minister urged two weeks ago the U.S. to postpone the planned deployment of missile defense sites in Europe and called for a delay of NATO's eastward expansion to mend frayed ties, AP reported.
Sergey Lavrov said the level of trust in Russian-U.S. relations is now lower than during the Cold War. He warned that by ignoring Russia's objections, the U.S. and its allies would further damage already tense relations.
""It's very important to take a break and freeze all that,"" Lavrov said in a speech at a conference. ""All these projects must stay where they are.""
Russian-U.S. relations have been strained over Washington's plans to establish missile defense sites Europe. Washington also has strongly backed plans for NATO to incorporate Russia's ex-Soviet neighbors, Ukraine and Georgia — an expansion that Moscow fiercely opposes.
Lavrov said the disputes in U.S.-Russian relations have badly hurt mutual trust.
""It may sound paradoxical, but we had more mutual trust and mutual respect on an inter-government level during the Cold War,"" he said.
He said that a new security pact for Europe proposed by Russia's new president, Dmitry Medvedev, earlier this month could help overcome Cold War-style divisions.
""That would create a new atmosphere of trust in the region,"" Lavrov said. ""We must stop sliding into the past, into the absurdity we all will be ashamed of. There are acute issues where we doubtlessly have common interests.""