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I think the main purpose of this ICC warrant was an attempt to disrupt Xi's visit to Moscow, and when this failed, everyone somehow quickly forgot about the warrant, as if it did not exist at all.
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Well that's some brain gymnastics right there. Why would it disrupt Xi's visit? Xi isn't really a price winning human rights activist either as they don't even recognize Dutch extradition treaty.
It sounds like you are just undermining the legitimacy of the warrant. And yeah, warrant exist, you would know this if you just looked it up, why do you think it's forgotten? Don't tell me, because he isn't arrested?
Nah, that would be a stupid answer.
https://www.icc-cpi.int/news/statement-prosecutor-karim-khan-kc-issuance-arrest-warrants-against-president-vladimir-putinRussia has not ratified the Rome Statute, so for Russian citizens this warrant is a legally insignificant piece of paper. It happens, the USA, Ukraine, China and many other countries have not ratified the Rome Statute either. Moreover, according to the Constitution of the Russian Federation, the incumbent president cannot be held criminally liable. And also in accordance with the Convention on the Prevention and Punishment of Crimes against Internationally Protected Persons (Adopted by resolution 3166 (XXVIII) of the UN General Assembly of December 14, 1973), heads of state enjoy absolute immunity. It sounds like you are just undermining the legitimacy of this Convention.

There must be thousands if not tens of thousands of "Khan" living in the UK, including, guess who? ... The current major of London, Sadiq Khan. I personally know a couple of "Khan" in my own country. It is a common name from certain region of Iran.
Now, could anyone point to any indication that this could be used, particularly since it is known and judged, to blackmail and that there is any close link between these people?
Khan, which is more popular as a surname, is a Turkish boy's name meaning "prince," so get ready to give your son the royal treatment. Khan is a shorter form of Khagan, and was originally a historic title given to military chiefs and rulers.
On the "useless piece of paper"... well, your argument is plainly stupid, including a deep lack of understanding of how international law works. Of course Putin will not get arrested while in Russia, China, etc... and of course your "constitution" can give him the right to but-fuck cows in public without any consequence. You do not seem to get the real problem here: Most of the government of Putin including himself are banned from international diplomacy. Another of the great achievements of your horse loving gay hating septuagenarian idol