Obama lied, as usual, and both Russia and China noticed (to put it mildly). That is the reason Russia, China and several other nations have voted against and vetoed any UN or US support activity in Syria.
It can't be proven, of course, but there are indications that Gaddafi was set up to be murdered, that he was on his way to what he'd been told by the "Nato Allies" was a meeting where he could make a deal to get out of the country. Instead, they told the rebels where they could ambush his convoy and provided air support for it. Gaddafi was many things but he was not stupid, and knowing the air surveillance capabilities of our military, would not have been out in the desert in such an exposed position without good reason.
What the Obama regime has accomplished in three short years is to completely destroy any trust in the word of the United States of America. Nobody trusts us now, not our enemies, and especially not our (former)friends. Even worse, they know we can't even be trusted to do what's obviously in our own best interests.
Our lack of trustworthiness is not just rooted in dishonesty, or even evil, but in a large measure of insanity. That's the source of the attitude and position of Russia and China you're describing.
Absolute proof exists that US/NATO "no fly" air power attacked and disabled Gaddafi's vehicles, heavier weapons, and much of his security rendering him defenseless against the pack of animals that murdered him.
The purpose was to make sure no future Libyan oil production was redirected to China, as contracted; to deliver Libyan gold into the hands of the World Bank and IMF, instead of Gaddafi's many victims; and to "liberate" as many of his weapons stores as possible for Muslim Brotherhood use against Israel.
What the Obama regime has accomplished in three short years is to completely destroy any trust in the word of the United States of America. Nobody trusts us now, not our enemies, and especially not our (former)friends. Even worse, they know we can't even be trusted to do what's obviously in our own best interests.
This is possibly the single most significant victory for America's enemies in our history. Even if Obama and the Rats are completely swept from power, this cannot be fixed.