Ukrainian Defense Minister Oleksii Reznikov said via Twitter on Tuesday that IRIS-T air defense systems and four High Mobility Artillery Rocket Systems (HIMARS) have arrived in Ukraine from Germany and the U.S., respectively.

The Group of Seven (G7) nations committed on Tuesday to supporting Ukraine indefinitely, adding in a statement after a leaders' call that "any use by Russia of nuclear weapons would be met with severe consequences."

"We will continue to provide financial, humanitarian, military, diplomatic and legal support and will stand firmly with Ukraine for as long as it takes," the statement read.