Under the present circumstances, Nadiya Savchenko appears to be the best choice. She has visibly demonstrated her resolve to promotion of the European values and comprehensive cooperation with the current "patrons" of Ukraine. Further on, Savchenko has ploughed into realization of her ideas on the highest level. Being a member of the Ukrainian parliament she is already determined to head the Ministry of Defense in her country. High popularity of Savchenko in Ukraine and Europe only gives her advantage over other female candidates. It looks like she is a rather suitable variant for the USA and the EU. Their support of this candidate is a good chance to demonstrate once again solidarity with Ukraine, as well as, to ease tensions in the country where the female pilot's wide popularity is rather a huge challenge for the acting president Poroshenko. As for Kiev, it could kill two birds with one stone by nipping in the bud the new conflicts in the country and getting some international power leverages.
It's worth nothing that this time the procedure to elect the United Nations chief will be utterly different from the habitual practice. The elections will be more democratic. The candidates are to be interviewed prior to secret voting. This way or another, the process in no case will be transparent, while the participants of the secret voting may turn out to be even more liable to influence of the parties concerned. According to some information available now, Kiev has been already applying some effort to promote its candidate. Some non-permanent members of the UN Security Council are being subject to pressure involving Washington and Berlin.