Suicide attack boats aren't a wholey new threat (see USS Cole) the US has been thinking about defending from small surface craft too. It's really hard to guess

Suicide attack boats aren't a wholey new threat (see USS Cole) the US has been thinking about defending from small surface craft too. It's really hard to guess how effective any attack and countermeasure will be until you see it in the field and given the shabby state of a lot of Russia's military I'm dubious that the results will be directly comparable especially since the planners on the US side are getting to see and evaluate both sides.