Russia and the U.S. met there a day earlier on a limited Black Sea ceasefire proposal that Washington hopes will open the way for broader peace negotiations.

A spokesperson for Russian President Vladimir Putin told reporters on Tuesday that the outcome of his country's talks with the U.S. in Riyadh "has been reported in the capitals" and is currently being "analyzed" by Moscow and Washington.

After the talks in Riyadh and the declaration of a truce regarding strikes on energy facilities, at least eight strikes on Ukrainian energy facilities have