Comment by bawolff

If a foreign national threatened or tried to improperly influence a US judge, you better belueve the US courts would claim juridsiction.

Generally speaking courts usually claim juridsiction over actions that take affect in their territory even if comitted outside of it (e.g. someone running a scam call center specificly targeting americans would likely get in trouble with us courts even if they never step foot there. Someone hiring an assain to kill an american will still get charged even if they never step foot in america). The ICC is not unique in this regard. The limiting factors here are politics and power not traditional views of how juridsiction works.

There is a difference between juridsiction and actual ability to execute judgements/orders.