Of course, the US has always played unfair and was a bad loser. No wonder that the ethical standards among the general populace are equally low.
My best guess would be that he's just a random far-right troll from Turkey. But I don't really care about where trolls come from.
Argumentum ad hominem. The last straw for the poorly minded in a lost discussion. Some people are their own worst enemy, if you just let them talk. It's a common pattern for Putin trolls.
I think it's even more convoluted. That it was Russia intending to make it look like it was the US, to create a divide among NATO countries. The worst thing for Russia has been the unity of EU and NATO countries. They would do anything to create division. Or they thought segments of the pipeline could be used to reverse the flow and send gas from Norway via Denmark to Baltics and Finland. Alternatively and less likely, US did it because they wanted to make sure the pipeline is permanently dead and won't come back online in the next 3-4 years, not entirely silly and I don't fault them for it.
Where are you from? If you think US has low standards then you really don't want to look into the history of Russia. Everything is dirty and on the government level it's basically a mafia style system in place with people being executed regularly. I won't even go into the fact that FSB agents were caught planting explosives in residential buildings with the intention of blaming the Chechens to prepare the soil for invasion. That's well documented btw.
I don't doubt you for a second, as mentioned, I am not a Russian fan boy at all. But at least I know the enemy and can keep him close. The US has played a convoluted game that puts everyone at risk to get stabbed in the back by our seemingly good friend/ally. It has happened many times. For good measure I recommend a study of history of the involvement of the US in Persia/Iran. Fascinating as well as absolutely disgusting how the US shamelessly abused and sucked dry entire cultures and regions. The US is not an ally or friend, it is a war mongering entity that was created by power-hungry elites that pass down their reign from generation to generation entirely through nepotistic behavior. Take a look at the few families and clans that inform military decisions and have a huge say in generation impacting decisions for society. But all that is hidden under the surface, they love to present themselves as the "freedom for all, we are all equal, and love to eat hamburgers, baseball games, and look, oh look how multicultural we are" society, yet the average Joe himself is one of the most enslaved and addicted individual on the planet. A nation of people who are highly sensitive and emotional, easy to leash out, when someone challenges and questions their "American way of life". Sadly most of them have not yet received the news that many other ways of life are in a lot of ways superior to theirs. And even when it's not its not their place to force theirs upon others.