President Barack Obama met Ukraine's president-elect Petro Poroshenko on Wednesday, in a show of U.S. support for Ukraine's right to chart its own future, before an encounter with Russia's Vladimir Putin.

Obama sat down with Poroshenko in Warsaw, during a trip designed to assuage security concerns in eastern Europe following Russia's annexation of Crimea and what Washington says is an effort to destabilize Ukraine. 

The United States said Wednesday it looks forward to working with the government of Egyptian president-elect Abdel Fattah al-Sisi, while urging him to carry out human rights reforms.

President Barack Obama will speak with the former army chief in the coming days, the White House said in a statement.

Arabs believe the Obama administration has little commitment to a Palestinian state, should not intervene militarily in Syria and mostly failed to support Egypt's interim leaders, a new poll released Tuesday showed.

Five years after President Barack Obama's landmark speech in Cairo aimed at re-setting ties with the Arab world, the poll revealed that while support for Obama, which had fallen in recent years, is on the rise again among most Arabs it still remains below an average of 50 percent.

U.S. President Barack Obama Tuesday defended a prisoner swap with the Taliban to free an American soldier, saying his "sacred" trust as commander-in-chief outweighed claims he broke the law and set a dangerous precedent.

Obama is facing rising questions about the deal to secure the release of U.S. Army Sergeant Bowe Bergdahl after five years, in return for the transfer of five Taliban prisoners from the "war on terror" prison at Guantanamo Bay.

U.S. President Barack Obama on Tuesday called on Russia to pressure separatists to stop attacking government forces in eastern Ukraine and to prevent the flow of fighters and weapons into the region.

Obama made the call in a press conference in Poland and also warned that further Russian action in Ukraine could lead to stepped-up economic sanctions.

President Barack Obama Tuesday proposed a $1 billion plan to finance extra U.S. troop, air and naval rotations to "new allies" in eastern Europe amid an East-West showdown over Ukraine.

The "European Reassurance Initiative," which must be approved by Congress, would also build the capacity of non-NATO states including Ukraine, Georgia and Moldova to work with the United States and the Western alliance and build their own defenses, the White House said.

President Barack Obama on Monday said his administration would provide special assistance to children arriving to the U.S. alone after making the treacherous overland journey from Mexico.

In response to what he called an "urgent humanitarian situation," Obama ordered federal departments to coordinate relief for the unaccompanied children, including medical care, housing and efforts to reunite them with their parents.

The dramatic deal to free soldier Bowe Bergdahl in exchange for Taliban prisoners ignited criticism after the insurgents' leader declared a "big victory", but also raised hopes for peace as the U.S. prepares to leave Afghanistan.

Washington has defended the swap as critical to saving Bergdahl's life, as his health had deteriorated sharply after five years spent as the only U.S. soldier held captive by the Taliban since the war began in 2001.

U.S. Defense Secretary Chuck Hagel expressed hope Sunday the release of U.S. Army Sergeant Bowe Bergdahl would lead to direct U.S. talks with the Taliban, as the extremist movement's leader hailed the prisoner swap as a “big victory.”

"It could, it might and we hope it will present an opening," Hagel said in an interview from Bagram Air Base in Afghanistan with NBC's "Meet the Press."

U.S. President Barack Obama said Saturday that an American soldier held for nearly half a decade in Afghanistan has been freed, in a swap for five Guantanamo detainees.

"Today the American people are pleased that we will be able to welcome home Sergeant Bowe Bergdahl, held captive for nearly five years," said Obama, announcing the release of the army sergeant.