The Hague - Russian intervention into eastern or southern Ukraine would be the clearest trigger for additional sanctions, as would violence in Crimea, a US official said on Monday.

He told Reuters that that G7 leaders, at their meeting in The Hague, had discussed the need for NATO to provide reassurance and support for Eastern European allies. G7 leaders, he said, had discussed consequences to other countries from potential sectoral sanctions on Russia, and had agreed that the costs would be worth it.

Leaders of the G7 said in a statement on Monday they were ready to intensify sanctions on Russia in case of a further destabilisation of Ukraine, whose southeastern Crimea Peninsula was annexed by Moscow last week. - Reuters