Stakhovsky, who reached a career singles high ranking of 31 in the world and won four ATP tour titles, said: "Of course I would fight, it's the only reason I'm trying to get back.
"I signed up for the reserves last week. I don't have military experience but I do have experience with a gun privately.
"My dad and brother are surgeons, they are stressed out, but I speak to them frequently - they sleep in the basement".
He urges people around Europe to protest against the Russian invasion wherever and however they can.