Mars doesn’t even have enough air pressure to support human life.
I was watching a program the other day that scenario’d an ice asteroid hitting the moon, causing an accretion ring around the Earth that would cause it rain 400 years. So theoretically, maybe we could tow an ice asteroid to Mars orbit and explode it, doing the same thing and creating oceans on Mars. But then again,would the increased drag of Martian oceans on it’s orbit, affect the Earth in some way?