Even a dialogue like this won't have much impact because there really isn't anything we can do now to hinder or stop their Invasion.
At the moment nothing can be expected of anything because indeed when sanctions are useless then one of the last hopes is to hope they stop this voluntarily although this is indeed very difficult to happen
I think what they mean by dialogue is when two countries talk to each other and not the kind of dialogue that is happening on this thread. Maybe they have tried talking to each other already but it didn't work out well so the other country have nothing to do but started a war. We that are only regular individuals can't do much to stop the war but some of us are still finding a way to help at least, that is why we have this boycott thing.
Like sanctions, boycots doesn't have the ability to stop the war but it can only help weaken Russia. For some that are against Russia, that's better than nothing but there are some that won't support this act for some reasons.
Thank you for straightening it out, when you say that it will be a little difficult considering that both parties will not accept each other's agreement, so this will indeed be something that is quite difficult to realize.
As for the boycott itself, I actually quite agree, even though it doesn't have any impact, but this can be used as a form of rejection of what they are doing, but on the other hand, I'm actually quite sorry for the civilians who are affected by their political interests impact.