Putin announces a 30-hour ceasefire that Zelenskyy dismisses as 'another attempt by Putin to play with human lives'.
Western brands have been hit by boycotts and other forms of protests in Muslim-majority countries due to the Gaza war.
The US president has threatened to 'move on' if he sees no progress from Russia and Ukraine.
After technical talks, senior negotiators are expected to reunite on April 26, according to Iran's foreign ministry.