(QHA) -

Leaders of the G7 nations are meeting today to discuss what further measures to take after Russia's annexation of Crimea, RFE/RL reports.

The G7 leaders, including U.S. President Barack Obama, will be meeting on the sidelines of a nuclear summit in the Netherlands.

U.S. Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov are also expected to hold face-to-face talks on the Ukraine crisis on the sidelines of the nuclear summit in The Hague.

The G7 meeting comes a day after NATO’s top military commander, General Philip Breedlove, said Russian troops massed on Ukraine’s borders pose a threat to Moldova’s separatist Transnistria region.

"There is absolutely sufficient force postured on the eastern border of Ukraine to run to Transnistria, if the decision was made to do that. And that is very worrisome."