Abe, now in Europe, met Cameron in Britain on Thursday.

Abe said he would like to upgrade long-established relations between the 2 nations as they share the same values, including freedom, democracy, basic human rights and the rule of law. Cameron also voiced hope to further develop closer ties.

A joint statement compiled by the leaders noted that Russia's attempt to annex Crimea is an unequivocal violation of international law and a serious challenge to the rule of law.

The statement expresses support for the democratic process in Ukraine, including a presidential election scheduled for later this month.