There's give and take here. For example, we see that US, UK and other NATO countries have their constituent special forces on the ground in Ukraine. For the Uni

There's give and take here. For example, we see that US, UK and other NATO countries have their constituent special forces on the ground in Ukraine. For the United States this requires a literal act of Congress if US troops are on the ground for more than 30 days. This is at a minimum an indictable offense by a sitting US president, though it is not without precedent.