To be clear about what genocide is... it's a policy of systematic erasure of a group of people (nation, religion, ethnic group). The purpose is to eliminate this group from existence, not to simply drive them to another territory or to rule over them.

If there is hard evidence (not propaganda) that Russian policy is to indiscriminately kill any and all Ukrainians they encounter, with the ultimate goal of seizing their territory and eliminating Ukrainians completely, then we have a genocide.

If Russian policy is to seize Ukraine and rule over Ukrainians, that's not genocide.