US President Joe Biden reiterated his steadfast support for Israel amid its war on Gaza in an opinion piece for The Washington Post published Saturday.

In the article, entitled 'The US won’t back down from the challenge of Putin and Hamas', Biden said the US "has Israel's back", but claimed he had been left "heartbroken" by the deaths of Palestinians in Gaza.

Here are some takeaways from Biden's opinion article.

Hamas and Putin: drawing equivalencies

Biden claimed Palestinian group Hamas shared similar goals with Russian President Vladimir Putin.

"Both Putin and Hamas are fighting to wipe a neighboring democracy off the map. And both Putin and Hamas hope to collapse broader regional stability and integration and take advantage of the ensuing disorder," Biden said.

"America cannot, and will not, let that happen. For our own national security interests — and for the good of the entire world."

The US has been unequivocal in its support for Ukraine, and earlier this month pledged billions of dollars in aid to both Ukraine and Israel.