While there is no evidence to support it, some experts are pointing at Putin's lukewarm response after the attack, and the fact that this division of efforts is immensely helpful to his invasion in Ukraine, and are wondering if he worked with Iran to help arm and plan this attack by Hamas.

So, in other words, "stretching its ability to support Ukraine" was the whole point.

https://thehill.com/opinion/international/4250708-putins-fingerprints-are-on-hamas/