Once again you're just spouting nonsense. ...

US Navy ships have been doing oil transfers from oiler tankers in the middle of the ocean since before WWll and it's still standard practice today.
en.wikipedia.org
Ah. Because the Navy does it. It must be easy. Nonsense.
The Navy experimented and found the best way to proceed. The people are not doing it cold. They observed it as junior Officers. They stood to as it was done with them watching and learning.
but we aren’t talking about refueling a Destroyer in a couple hours. We are talking about transferring an enormous volume of oil, crude oil.
First. The oil is thick. So it has to be heated to facilitate the transfer. So hot oil, literally a lake worth, is in that tanker.
Then how much you can transfer depends on how big the hoses are. A four inch hose which is incredibly heavy would transfer perhaps 500 gallons per minute.
That sounds like a lot. But it would take 24 hours to transfer the oil from one VLCC. Probably longer for a ULCC.
Now they won’t be able to do this in normal shipping lanes. Too much risk of needing to maneuver to avoid traffic, so they’ll be well off the lanes. Well away from any help.
The ships must maintain steerage speed. Say. At least five knots. Probably seven. As they are moving forward the propellers are generating suction between the ships. So the helms have to be ready to make minute adjustments quickly.
And here we are at another problem. Tankers are not very maneuverable. They are slow to respond. As the suction draws them together the ships won’t be able to avoid a collision. These are not nearly as responsive as a naval vessel where quick and extreme maneuvers may save lives in combat.
So collision between two large ships is very likely.
Unlike Naval vessels that have quick disconnect fittings. The hoses for oil tankers and regular ships are bolt on. So a dozen bolts have to be installed and tightened to get the hose secure. If the ships move too far apart. The hose will break and oil will be shooting everywhere at 500 gallons per minute.
As I’ve said before. I really hope the Russians are doing this. Because dead Russians are a good thing. And this will result in lots of dead Russians.