Russell wanted to stay out for longer which caused him to have older tyres followed by cars with newer tyres.

He wanted to try what Carlos did with Lando giving tow to Hamilton to prevent Carlos from overtaking both. It was not possible since by having older tyres he was slower and would have made both of them slower leading to both being overtaken by Carlos. Hamilton was asked to give a tow to Russell the next lap which he did give but Carlos was already next to Russell, therefore he failed to benefit. In Singapore there are very few places to overtake which is not true in Suzuka.

There is something called situational awareness. Russell might learn in the future if he keeps his head clean.