And in other nuclear-related matters. The US and Russia will exchange nuclear arsenal data next month under a New Strategic Arms Reduction Treaty, or what's also known as the START agreement.

The US State Department said Washington reached its reduction target in 2017, and expects the upcoming data exchange will also reaffirm Russia's commitment. The treaty took effect on February 5th, 2011, and passed its seven-year deadline on Monday. It calls for the two sides to reduce their number of nuclear warheads to less than 1550, limit the number of delivery systems, and conduct strict verification and data exchanges.