MOSCOW (Reuters) — The bosses of ExxonMobil and BP are set to take part in an energy conference presided by Russian President Vladimir Putin in a rare trip to Moscow.

Woods and BP boss Robert Dudley are listed among the panelists of this week’s conference, which is also expected to be attended by officials from Iran, Saudi Arabia and Venezuela.

ExxonMobil CEO Darren Woods might meet Putin in Moscow on Wednesday on the sidelines of the conference, Kremlin spokesman Dmitry Peskov said. Peskov said that Putin and Woods, if their meeting happens, would discuss “potential cooperation areas” in a “short meeting”.

BP declined to comment on Dudley’s plans.

Western oil executives frequently visited Russia before relations with Moscow soured in 2014 following the annexation of Crimea by Russia and subsequent insurgency in eastern Ukraine. As the result of the sanctions, ExxonMobil had to withdraw from joint energy projects with Kremlin-controlled Rosneft in the Arctic.

BP holds a 19.75% stake in Rosneft.