Between NATO members on how best to handle the situation. The United States and other NATO allies have imposed sanctions against Russia for its annexation of Crimea and support for separatists in eastern Ukraine, but some members have called for more cooperative measures to end the conflict.
Some have argued for a diplomatic approach, while others have pushed for a more robust military response. The United States has been more vocal in its support for Ukraine and has provided assistance in training and equipment.
NATO has also increased its presence in the region and held military exercises in the Black Sea. Ultimately, the alliance has been united in its commitment to stand with Ukraine and to defend its territorial integrity.