U.S. President Barack Obama AP LONDON - President Barack Obama says he has accepted an invitation from Russia President Dmitry Medvedev to visit Moscow and will make the trip in July.

Obama was hailing a new agreement between the two leaders to reach a new nuclear arms deal before the existing treaty between the countries expires in December.

Obama said the United States and Russia are making "great progress."

The presidents agreed to begin talks on a new, binding agreement to limit their nuclear arsenals.

Medvedev said the talks will lay the groundwork for progress on other issues with the U.S.