Israel repeated its calls for people to leave northern Gaza, including by dropping leaflets from the air.
Just 20 trucks were allowed in, an amount aid workers said was insufficient to address the unprecedented humanitarian crisis.
The US State Department warned Americans across the globe “to exercise increased caution” because of “increased tensions in various locations.
Kurmasheva's arrest marks the second instance this year of an American journalist being held in Russia.
He faces serious charges that could result in up to 10 years in prison.
"Anyone who wants to identify with Gaza is welcome. I will put them on the buses heading there now."
He applauded Israel’s precautionary measures to ensure the safety of civilians.
The Russian leader was the guest of honour among leaders and officials from more than 130 countries.
Some relatives of the roughly 200 people taken hostage and forced back to Gaza after Hamas attacked, reacted in fury…
He claims over 3,000 persons, mostly women and children have been killed since Israel's retaliatory attacks.