File photo: Qatar's Emir Sheikh Tamim bin Hamad al-Thani. AFP
"As you know, we reached an agreement months ago, but unfortunately, Israel did not abide by this agreement," said the ruler of Qatar, a key mediator of the deal.
A truce in Gaza between Israel and Hamas, brokered by Qatar with Egypt and the United States, came into force on January 19, largely halting more than 15 months of the Israeli war.
The initial phase of the truce ended in early March, with the two sides unable to agree on the next steps. Israel resumed air and ground attacks across the Gaza Strip on March 18 after earlier halting the entry of aid.
Israel said Wednesday that it had converted 30 per cent of Gaza into a buffer zone in the widening offensive.
Sheikh Tamim said Qatar would "strive to bridge perspectives in order to reach an agreement that ends the suffering of the Palestinian people, especially in Gaza".
Putin recognised Qatar's "serious efforts to resolve the Palestinian-Israeli conflict" and called the deaths in the conflict "a tragedy".
"A long-term settlement can only be achieved on the basis of the UN resolution and, first of all connected to the establishment of two states," he added.
Israel's renewed assault has so far killed at least 1,691 people in Gaza, the Palestinian health ministry said, bringing the overall toll since the war erupted to 51,065 Palestinians.
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