Khalil Abu Laila said the invitation was sent to Hamas politburo chief Khaled Meshaal, who lives in exile, and that a date for the visit would be agreed later.
Hamas had already said it would accept Moscow's invitation, which has upset Israel and the United States by challenging their campaign to isolate the group unless it renounces violence and recognises the Jewish state's right to exist.
The Russian initiative has seemed to open a crack in the Quartet of Middle East mediators -- including the United Nations, European Union and Washington.
But Russian Foreign Minister Sergei Lavrov said on Wednesday that Moscow agreed that Hamas must commit to seeking peace with Israel to win international acceptance.
"We will work towards Hamas accepting the Quartet's positions. This is not just the Quartet's opinion but also that of the majority of nations, including Arab nations," he said after talks with EU leaders in Vienna.Last Mod: 20 Eylül 2018, 18:16