If you invite someone over to your apartment to drink scotch, and then they come on to you, that's not sexual assault. Sexual assault is when someone has sex with another person without their permission.
If you tell someone to leave (NOW!) after they indicate they want to sleep in your bedroom when they've been offered the couch and then they forcibly kiss you that is in fact sexual assault, in fact even if none of the former had happened it would still be sexual assault. Force => assault. When someone has sex with another person without their permission it is rape .
The US Justice Department doesn't construe a forced kiss as sexual assault: https://www.justice.gov/ovw/sexual-assault
"Sexual assault is any type of sexual contact or behavior that occurs without the explicit consent of the recipient. Falling under the definition of sexual assault are sexual activities as forced sexual intercourse, forcible sodomy, child molestation, incest, fondling, and attempted rape."
I understand this incident occurred in Malaysia, which doesn't follow US law, but I don't believe they consider it sexual assault either. Some cursory review of LEO online forums is indicated a forcible kiss would be considered the lesser "sexual battery".
"The primary difference between sexual battery and rape is that with battery there is no penetration between the sexual organs. With sexual battery, all that matters is the non-consensual touching of another person's sexual organs. Sexual assault, like the broader crime of assault, constitutes the threat of force."
Even under that definition, I'm unsure if a kiss is considered either sexual assault or sexual battery, since sex organs aren't involved.
IANAL.
Edit: Appreciate the replies! You learn new things every day.