Russian Foreign Minister Sergei Lavrov speaks during a news conference, dedicated to Russia's foreign policy in 2016, in Moscow, Russia, January 17, 2017. REUTERS/Sergei Karpukhin

MOSCOW (Reuters) - The aim for upcoming peace talks on the Syria crisis in Astana, Kazakhstan, is to consolidate a ceasefire and involve opposition field commanders, Russian Foreign Minister Sergei Lavrov said on Tuesday.

Lavrov also told a news conference that more opposition militants had the right to join the ceasefire and that many had asked to do so.