It goes back to an old principle that I think journalist and well known sci fi author Frank Herbert put well:
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Law always chooses sides on the basis of enforcement power. Morality and legal niceties have little to do with it when the real question is: Who has the clout?"
There is another aspect to all of this though, and I think it's far more important than who enforces their will on the other, and that's who is -morally- right. I'm not saying that Russia hasn't made mistakes, but when it comes to Ukraine, they weren't the ones who started bombarding Ukrainians. That would be Ukraine's Kyiv based government, way back in 2014. For 8 years, Russia tried to resolve with conflict diplomatically, with 2 Minsk accords. It was the U.S. and its NATO allies that turned a blind eye to the atrocities committed by Ukraine's Kyiv based government against eastern Ukrainians.
The really humorous thing here is that, like Russia, the U.S. withdrew the U.S. from the ICC's jurisdiction as well, and a lot sooner than Russia did. RT wrote an article detailing this fact yesterday. Quoting from it:
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Former US national security advisor John Bolton has come out against the International Criminal Court’s (ICC) decision to indict Russian President Vladimir Putin, calling the court “fundamentally illegitimate.”
“I believe and have for many years [that] the International Criminal Court is fundamentally illegitimate,” Bolton told Sky News on Monday, adding that its arrest warrant for Putin is “not something that the United States should cooperate with.”
“It’s a very dangerous institution,” he continued. “It is an exercise of governmental power in a vacuum without any constitutional framework to restrain it.”
The Court's pre-trial Chamber issued a warrant on Friday for the arrest of Putin and Russian Children's Rights Commissioner Maria Lvova-Belova for the “unlawful deportation” of children from “occupied areas of Ukraine.” The charges refer to Russia’s efforts to evacuate civilians away from areas – mostly in the predominantly Russian-speaking region of Donbass – shelled by the Ukrainian military.
Neither the US nor Russia recognize the ICC’s jurisdiction. Speaking to reporters on Friday, US President Joe Biden said that he believed the arrest warrant was “justified,” but admitted that the court was “not recognized by us either.”
In addition to sanctioning a number of top International Criminal Court officials in 2020, the US maintains the ‘Hague Invasion Act’, giving its military permission to invade the Netherlands were any US citizens detained at the court.
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Source:
Putin arrest warrant court 'fundamentally illegitimate' – Bolton | RT
I don't know if Russia has something similar to the Hague Invasion Act, but I'm fairly certain that it'd invade Denmark anyway if they managed to detain Putin. What's especially ironic here is that the ICC may have decided to target Putin in large part due to the U.S. encouraging it to do so:
The US has The Hague Invasion Act, but wants The Hague to target Russia | RT