Two U.S. F-22 Raptor stealth fighters landed in Poland on Monday, as regional tensions run high over Russia and the conflict in Ukraine.

The arrival of the two planes was aired on TVP Info public television channel. They flew in from their German base of Spangdahlem into the Lask air base in central Poland.

Conservative lawyer Andrzej Duda was sworn in on Thursday as Poland's president, promising generous social benefits and calling for a greater NATO presence in the region amid concerns over the perceived threat from Russia.

The 43-year-old devout Catholic with an easy smile, who is allied with the populist Law and Justice (PiS) opposition party, took over from liberal Bronislaw Komorowski, whom he unexpectedly defeated in a May vote.

Magdalena Chudzicka, a mother of four, is rolling out her welcome mat.

Her family is among dozens in Poland opening their homes to Syrian Christians fleeing war and Islamic State (IS) persecution, part of a ground-breaking drive by the Catholic nation's tiny Protestant community to save lives.

NATO flexed its muscles Thursday in Poland during the first full drill of its new spearhead force, a structure designed to boost security on its eastern flank in the wake of Russia's annexation of Crimea from Ukraine. 

Around 2,100 soldiers from nine NATO states grouped in the Very High Readiness Joint Task Force (VJTF) took part in the Noble Jump 2 exercises at the Zagan training range north-western Poland.

NATO member Poland said Thursday that the post-Cold War period of peace is "now over", as the European Union grapples with various crises including the Ukraine conflict and terrorism.

Poland's defense minister spoke alongside NATO head Jens Stoltenberg in western Poland while attending the first full exercise of the Western defense alliance's new rapid reaction force -- part of NATO's biggest defense reinforcement since the Cold War.

Poland said on Sunday it is in talks with the United States on the possibility of Washington storing heavy weaponry on Polish soil, as regional tensions run high over Russia and the conflict in Ukraine.

Defense Minister Tomasz Siemoniak said the negotiations were part of discussions on increasing the American military presence in Poland and other eastern European members of NATO.

Poland's centrist Prime Minister Ewa Kopacz was scrambling Thursday to limit damage from a lumbering eavesdropping scandal just four months ahead of a general election which polls show could usher the conservative opposition into power.

Three Polish government ministers and the speaker of parliament resigned Wednesday over the high profile scandal that first broke last year and Kopacz has vowed to purge anyone else tainted by it from her government.

Three Polish government ministers and the speaker of parliament tendered their resignations Wednesday over a high profile eavesdropping scandal, the country's premier said.

Centrist Prime Minister Ewa Kopacz announced that Parliamentary Speaker Radoslaw Sikorski and the ministers of the treasury, health and sports had resigned as her unpopular government faces a general election this autumn.

NATO on Tuesday launched the first full drill of its new spearhead force in northern Poland, a structure designed to boost security on its eastern flank in the wake of Russia's 2014 annexation of Crimea from Ukraine.

Around 2,100 soldiers from nine NATO states grouped in the Very High Readiness Joint Task Force (VJTF) are taking part in the Noble Jump 2 exercises at the Zagan training range north-western Poland.

The movement of an anti-establishment rock singer, who scored a surprising 20 percent in the Polish presidential vote, topped an opinion poll released Monday, just months ahead of a parliamentary ballot.

If the general election was held today, musician Pawel Kukiz would score 24 percent of the vote, tied with the conservative main opposition party Law and Justice (PiS), a survey of 1,100 people by pollster Ibris said.