U.S. military assistance to Ukraine will not be limited to the supply of Javelin anti-tank missile systems.

"There are no grounds for believing that merely sending Javelin missiles (which, in any case have yet to arrive) suffices to show resolve and convince [Russian President Vladimir] Putin to withdraw," Stephen Blank, a Senior Fellow at the American Foreign Policy Council, wrote in an article for The Second Line of Defense.

Read alsoRussia to "draw conclusions" from U.S. lethal aid to Ukraine - Lavrov"Ukraine still has great need of radio-electronic and ISR capabilities to counter Russian UAVs, fire-control capabilities, and Russian ISR," he said.

"Therefore it will be necessary not only to sustain the reforms needed in Ukrainian defense and defense industrial structures as well as across the economy and government. It is also equally necessary to give Ukraine the tools that it cannot produce on its own to counter the Russian threat and allow free people to defend themselves against aggression," Blank wrote.

"By all accounts, Ukraine's defense industry is quite capable and making considerable strides since 2014. But it is hardly able to match the technological level of Russia's [electronic warfare] EW and ISR capabilities for fire control."

"Ukraine can also contribute, e.g. NATO can use Kyiv's fleet of transports to bring forces rapidly from Western and Central Europe to Poland, the Baltic States, or the Balkans against Russian threats. This move would benefit both NATO and its members as well as Kyiv and represent a very visible political sign to Moscow," he stressed.