PARIS (AP) — Laying out clear conditions, President Barack Obama and Western allies opened a pathway for Russia to ease tensions in Ukraine on Thursday but pointedly warned Moscow it could face new sanctions within weeks if Vladimir Putin fails to go along.

The leaders, who were gathered in Brussels for a wealthy-nations summit, said the Russian president could avoid tougher penalties in part by recognizing the legitimacy of the new Ukrainian government and ending support for an insurgency in eastern cities that is widely believed to be backed by the Kremlin. There was no mention of rolling back Russia’s annexation of the Ukrainian region of Crimea, which precipitated the European crisis.