The Ukraine’s application to join NATO on the eve of the NATO summit is an unhelpful intervention in global politics.
We were told by the EU and others that the EU wished to sign an Association Agreement with the Ukraine to promote more trade and friendship. It was not for military purposes. The Agreement belied that, as Russia pointed out, as it did include a clause about defence matters. To compound that with offering NATO membership would alarm Russia.
There are three good reasons to say No to the Ukraine. The first is we do not know what country would join. Is it Ukraine on its old boundaries? In this case we have the dangerous anomaly that part of a NATO country would be under Russian control. Would it be on current de facto boundaries? In which case parts of a NATO country would not be under the military and civil control of its main government. Would it be the Ukraine minus its Russian speaking pro Russian areas? That would be unacceptable to the current Kiev government.
The second is NATO is in no position to guarantee the borders and territory of Ukraine from all comers. The Ukraine is too close to Russia. We could not protect it fully at acceptable military cost to ourselves, and without undue death and damage to the Ukraine if some of it is taken by Russia as Crimea has been.
The third is we should not be willing to encourage the government in Kiev all the time it is part of the violence and death being visited on its own people, whatever the rights and wrongs of who started it and who is mainly to blame for its continuation. NATO should encourage democratic and peaceful regimes, who can keep their countries well governed by words and votes, not bombs and bullets.