Indeed , rather than simply being a domestic or even regional crisis , what has been unfolding this year constitutes a violation of international law , undermining the existing checks and balances of the international system . Ambassador : Russian aggression against Ukraine has been challenge to Ukraine . Olexander Motsyk : Ukraine has violated terms of Budapest Memorandum . Time for Ukraine to rethink relationship with Russia , he says .
Ambassador : Russian aggression against Ukraine has been challenge to Ukraine . Olexander Motsyk : Ukraine has violated terms of Budapest Memorandum . Time for Ukraine to rethink relationship with Russia , he says .