(Reuters) – BUCHA/LVIV, Ukraine – Moscow signaled it was scaling back its ambitions in Ukraine to focus on territory claimed by Russian-backed separatists as Ukrainian forces went on the offensive, recapturing towns on the outskirts of the capital Kyiv. REFUGEES * About 3.7 million people have left Ukraine since the conflict began, a U.N. refugee official said. * A United Nations human rights team is looking into allegations that civilians have been forcibly moved from Mariupol to Russia, a senior official said. FIGHTING * Local officials, citing witness accounts, said as many as 300 people ma…