Photo: The crew of the U.S. Coast Guard Cutter Bertholf (WMSL 750) on patrol in the Western Pacific Ocean Jan. 22, 2019. U.S. Coast Guard photo by Chief Petty Officer John Masson
The U.S. Coast Guard Cutter Bertholf pulled into Sasebo March 3 following a deployment in the East China Sea where the crew assisted in United Nations Security Council Resolutions (UNSCR) enforcement against illicit ship-to-ship transfers that violate North Korea sanctions.
Thought something unusual was going on when Bertholf departed. Plus we have the Commandant’s Thursday State of the Coast Guard address is to include, “Coast Guard deployments to the western Pacific Ocean in support of U.S. national security and foreign policy objectives.”
Thought we might get into this.
Note, Bertholf was enforcing sanctions in the East China Sea. It may have been less upsetting to China that this was being done by a white hull, than by a gray hull with a Coast Guard detachment on board. Probably the same would be true about upsetting the Russians on the Eastern side of the Peninsula.
Chuck Hill's CG Blog 
Now we have word that Bertholf passed through the Taiwan Strait in company with a US Navy destroyer in a move that is sure to have the Chinese complaining. https://www.reuters.com/article/us-usa-taiwan-military/u-s-navy-coast-guard-ships-pass-through-strategic-taiwan-strait-idUSKCN1R50ZB?feedType=RSS&feedName=topNews&utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+reuters%2FtopNews+%28News+%2F+US+%2F+Top+News%29
Thanks to Walter for bringing this to my attention.
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China failing to enforce UN sanctions against N. Korea.
https://gcaptain.com/photos-capture-north-korea-ships-sanctions-busting-in-chinese-waters-u-n-report/
French efforts in support of the embargo. https://www.navalnews.com/naval-news/2021/03/french-navy-busts-illegal-oil-transfer-during-north-korea-embargo-enforcement-mission/