International matters are very complex, and the United States should to look to other alternatives when it comes to foreign issues. The Syria situation is tragic, and the lives of men, women, and children were lost, but the United States should seek foreign support before they become involved in such a precarious situation. There are many countries who don't trust the intentions of the US, but those same countries might be more receptive to resolutions brought forth by Russia.
No, the United States cannot trust Russia in the Syria situation, because Russia can't be trusted in general. Russia made a lot of progress in the days after the collapse of the Soviet Union, but Vladmir Putin has taken Russia several steps backwards towards a socialist or communist state. It is more important that the United States form its own opinion.