Russian Foreign Minister Sergei Lavrov and US top diplomat Marco Rubio held "frank" talks on the Ukraine war during a meeting Thursday, both sides said, as Washington hit out at Moscow's lack of "flexibility".

Rubio and Foreign Minister Sergey Lavrov held talks in Kuala Lumpur on the sidelines of the annual Association of Southeast Asian Nations Regional Forum, which brings together 10 ASEAN members and their most important diplomatic partners including Russia, China, Japan, South Korea, European nations and the U.S.

Secretary of State Marco Rubio met with Russian Foreign Minister Sergey Lavrov in Malaysia Thursday at a meeting of the Association of Southeast Asian Nations. The two discussed the Russia-Ukraine war.