ABU DHABI – Ukrainian President Petro Poroshenko is expected to meet with U.S. defense companies Tuesday during a major arms exhibition here even though the American government has not cleared the firms to sell Kiev lethal weapons.

Frank Kendall, the Pentagon’s acquisition executive is scheduled to meet with a Ukrainian delegation Monday evening, however Poroshenko is not expected to be there. Kendall, in an interview, said he will be bringing a message of support from the United States.

“I expect the conversation will be about their needs,” Kendall told Defense One a few hours before the meeting. “We’re limited at this point in time in terms of what we’re able to provide them, but where we can be supportive, we want to be.”

To this point, the United States has only given Ukraine non-lethal items, including medical supplies, body armor, sleeping mats, water-purification units, small power generators and hand fuel pumps. Ukrainian officials have been lobbying for armored vehicles and reconnaissance equipment.

As undersecretary of defense for acquisition, Kendall does not negotiate Defense Department policy with allies.

“I’ll be … primarily in listening mode trying to understand what their needs are,” Kendall said.

Dozens of U.S. and foreign-made armored trucks, the types wanted by Ukraine, are on display here at the International Defense Exposition and Conference, known as IDEX.

(Read more: US Military Increasing Foreign Expo Presence After 2-Year Downturn)

In Minsk earlier this month, Belarus, Russia, Germany, France and Ukraine, agreed to a package of deals, including a ceasefire in the Donbass region of eastern Ukraine. The Ukrainian military has been fighting pro-Russian separatist forces in the region for roughly a year. Western officials say Russia has sent tanks, artillery, rocket launchers and other weapons in and near Eastern Ukraine.

“The U.S. is obviously very concerned about the situation there,” Kendall said. “We’re hopeful that the ceasefire will take real effect [and] will hold.”

A Ukrainian delegation has been visible in the exhibit hall here at the IDEX since Sunday.

The U.S. is said to be considering giving Ukraine lethal defensive weapons, however several NATO defense ministers meeting in Brussels earlier this month spoke against sending these types of arms to Ukraine.

Russia’s support for militants that have been fighting in eastern Ukraine for nearly a year has rekindled Cold War memories for the U.S. and NATO allies alike. It has prompted pledges for increased NATO defense spending, particularly by eastern European members of the alliance.