Poroshenko: Heavy Weapons to Return to Front Lines if Truce Breached

Ukrainian servicemen stand near an area where fighting has waned substantially in recent days as a cease-fire deal forged last month increasingly takes effect, eastern Ukraine, March 3, 2015.

A small dog peers from a car as soldiers search it at a Ukrainian army checkpoint leading to Russia-backed separatists territory, near Kurakhove, Ukraine, March 3, 2015.

Servicemen stand inside a heavy machine-gun position at a Ukrainian army checkpoint near Kurakhove, Ukraine, March 3, 2015.

A convoy of Ukrainian armed forces, including armored personnel carriers, military vehicles and cannons, prepare to pull back from the Debaltseve region, in Blagodatne, eastern Ukraine, Feb. 27, 2015.

Russia and Ukraine's energy ministers are holding emergency talks in Brussels as Russian gas giant Gazprom threatens to cut off deliveries to Ukraine for lack of payment, at EU headquarters in Brussels, March 2, 2015.

A convoy from the Ukrainian armed forces, including armored personnel carriers, military vehicles and towed artillery pieces, begins to pull back from the Debaltseve region, in Blagodatne, eastern Ukraine, Feb. 27, 2015.

Ukraine President Petro Poroshenko visits the National Defense University in Kyiv, Feb. 27, 2015.

A priest bows as Russia-backed separatist fighters drive in a self-propelled 152 mm artillery piece, part of a unit that was moved away from the front lines, in Yelenovka, near Donetsk, Feb. 26, 2015.

A Russia-backed separatist fighter sits in a self-propelled 152 mm artillery piece, part of a unit that moved away from the front lines, in Yelenovka, near Donetsk, Feb. 26, 2015.

Russia-backed separatist fighters stand on self-propelled 152 mm artillery pieces, part of a unit that moved away from the front lines, in Yelenovka, near Donetsk, Ukraine, Feb. 26, 2015.

In a long-awaited development, Ukrainian forces and pro-Russian separatist fighters announced they are moving heavy weapons from the front line in eastern Ukraine. In this photo, a Ukrainian serviceman speaks with local schoolboys in the village of Chermalyk, eastern Ukraine,  Feb. 26, 2015.

Russian Foreign Minister Sergei Lavrov leaves the French Foreign Affairs Ministry following a meeting on a peace deal for Ukraine, in Paris, Feb. 24, 2015.

Ukrainian President Petro Poroshenko reviews his selfie with an Emirati media representative at the International Defense Exhibition and Conference, known as IDEX, in Abu Dhabi, United Arab Emirates, Feb. 24, 2015.