No they aren't. That was the plan, but...nope.
Kharkiv is 30 miles from the Russian border and 300 miles EAST of the Dniepr.
In nearly 6 months of trying, Russia has never been further away from taking Kharkiv than they are today and they now have ZERO path to take Odessa. Zero. (just bridges with holes in them)
We all think Biden is Trojan Corpse brain dead idiot with London School of economics graduates with their hands up his butt making his mouth move, but The Dream of Russia Controlling 80% of Ukraine's GDP is a crack pipe one.
You're utter clueless as to what the Russian war strategy is, embarrassingly so. The plan was not to take Kharkiv. The plan to liberate Lugansk and Donetsk, clear out the neo-Nazi Azovs from Mariupol, take the Kherson region and secure a land bridge from Russia to Crimea.
Russia is very close to accomplish all of that. The only thing left is to clear out the remaining Ukrainian army from Donetsk.
Russia now controls 80-90% of the Black Sea coastline. Kherson soon will vote either joining the Russian Federation or becoming an independent state.
Russia continues to gain territory daily. And, they will continue to unless Ukraine surrenders.