U.N. Secretary-General Antonio Guterres is headed to Moscow for a meeting with Russian President Vladimir Putin in a renewed bid to try to get him to agree to a pause or end to his 2-month assault on Ukraine.

Guterres’ spokesperson said the U.N. chief is later going to Kyiv, Ukraine, to meet with President Volodymyr Zelensky, because U.N. Secretary-General feels there is a “concrete opportunity” for progress.

En route to Moscow, Guterres met Monday in Ankara with Turkish President Recep Tayyip Erdogan, who has attempted, but failed so far, to mediate.