As President Zelensky was making his way to Japan for this weekend’s meetings with leaders of the group of seven richest countries, the Ukrainian leader found himself in an awkward position Friday at Riyadh, sharing a summit room with Russia’s top Mideast ally, President Assad of Syria.

At Hiroshima, Japan, Mr. Zelensky will try to convince the G7 leaders that he needs more arms to win the war Moscow launched more than a year ago. The group has already announced a new set of sanctions on Moscow. More importantly, President Biden reportedly has changed his mind: He is now ready to approve the sale of F-16s to Ukraine and train its pilots on the advanced fighter jets.