According to the Al Arabiya report, the latest intelligence suggests the Iranian response may be delayed until Thursday or Friday.
If Ismail Haniyeh represented a tougher stance in the deal negotiations compared to Sinwar's more pragmatic line, an obstacle has been removed, the author writes.
The fighter jets also struck a Hezbollah terrorist infrastructure site in the area of Kfarkela in southern Lebanon.
US President Joe Biden discussed with Qatar and Egypt finalizing a ceasefire and hostage deal to ease regional tensions.
Sinwar has remained an elusive figure since the onset of the October 7 massacre, of which he was the primary mastermind and the ensuing Israel-Hamas war.
During the "night of rage" event later that evening, speakers said that they would never recognize Israel and glorified Haniyeh and other terrorists who died fighting against Israel.
Putin advised Iran to avoid attacks on Israeli civilians in response to Hamas leader Haniyeh's killing, while Iran seeks Sukhoi jets and advanced defense systems.
However, US intelligence remains unclear about who will attack first and what type of attack each intends to carry out, said the senior officials.
CDU foreign policy expert Roderich Kiesewetter told Spiegel that Germany should offer Israel military support to defend against Iran's attacks.
Palestinian President Mahmoud Abbas condemns the assassination of Hamas leader Ismail Haniyeh as a move to extend the Gaza conflict and hinder peace negotiations.