Moscow previously lamented there is no agreement in the U.S.-led coalition in Syria on who should be declared legitimate opposition to Syrian President Bashar Assad's government — or should be targeted like the Islamic State group. Russia and Western nations have been engaged in intense diplomatic talks in the past few weeks, aiming to bring about a political settlement in Syria, which has been torn by a civil war since 2011 that has killed 250,000 people and forced millions to flee.