Russia's President Vladimir Putin was meeting President Bush at the White House Friday for talks on bilateral and global issues.
White House officials have said the talks will focus on deepening the U.S.-Russian partnership to face current challenges and opportunities.
Relations between the two leaders have been strained recently by differences over Iran's nuclear program. Mr. Putin supports Iran's right to develop nuclear technology, while Mr. Bush warns that the Islamic republic may be seeking nuclear weapons.
Mr. Putin traveled to Washington after addressing the United Nations World Summit in New York on Thursday.
In his speech, he warned terrorism is the main threat to human rights and development, and called on the United Nations to be the center for international anti-terrorism efforts.