Is there some credible reason to actually believe this?

That Ukrainians did it?

https://www.reuters.com/markets/commodities/ukrainian-man-ar...

That they did it for their own motivations?

It seems at least as plausible that they did it because wanted to hurt Russia as it does that Washington ordered them to do it, to put it mildly. Washington has been supporting Ukraine during the war but has been rather reticent to support attacking Russian assets that are outside the territory of Ukraine.

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