Poroshenko's ten-day ultimatum to Russia has some additional peculiarity, which deserves to be pointed out. The ultimatum comes right after Poroshenko returned from his trip to Australia, which suggests that he was meeting there not only with Australians. Then, in fact, one who made the ultimatum public was actually not Poroshenko himself, but Oleg Tyagnibok, the leader of the Nazi Svoboda Party, which failed to make it into the new parliament in the junta-controlled elections on October 26. But Tyagnibok was and remains one of the three main Maidan leaders and his party was behind the small recent Maidan in Poroshenko's home town of Vinnitsa.
Tyagnibok thus gave his voice to Poroshenko's ultimatum, referring to an emergency meeting between Poroshenko and the junta's political elite. Neither Poroshenko himself nor the Ukrainian government either denied or confirmed what Tyagnibok declared on behalf of Poroshenko. This in itself offers some possible buffer and later deniability for Poroshenko. But the fact that the Kiev regime choose Tyagnibok adds yet another dimension. On the one hand, Tyagnibok who is supposed to have no longer officially a place in the ruling clique. On the other hand, he is and remains the leader of the most openly Nazi party of the Maidan. And thus to make him announce the "ultimatum" to Russia thus also means that Kiev and its sponsors chose one of the worst possible messengers to deliver the already more than brazen demand to Moscow.
This suggests that Washington would like to see not only surrender, but also the greatest possible humiliation. And if it cannot have surrender, then humiliation for now would do in the eyes of Washington. And thus we have an interesting cascade when it comes to the "ultimatum": from Washington to Poroshenko and from Poroshenko to the leader of the Nazi party who becomes the mouth of the former two.
For a very good discussion of this ultimatum by Boris Rozhin see here: https://vk.com/strelkov_info?w=wall-57424472_34381