Story highlights "We cannot let the government be destabilized when the country is at war," PM Arseniy Yatsenyuk says

Ukrainian President Petro Poroshenko had called for Yatsenyuk to step down in February

Kiev, Ukraine (CNN) Ukrainian Prime Minister Arseniy Yatsenyuk announced Sunday that he will resign amid an ongoing political crisis.

"We cannot let the government be destabilized when the country is at war," he said during a televised address.

His formal resignation is expected Tuesday.

Yatsenyuk called for the formation of a new government, and said on Twitter that politician Volodymyr Groysman had been nominated to replace him as Prime Minister.

The core of our problems is not purely political. It is ethical. If morality requires changing the polit. rules, then it's certain to occur — Arseniy Yatsenyuk (@Yatsenyuk_AP) April 10, 2016

As of today my goals are broader: new electoral law, Constitutional reform, Judicial reform, Ukraine's membership in the EU and NATO — Arseniy Yatsenyuk (@Yatsenyuk_AP) April 10, 2016

He also said that the heart of Ukraine's problems is not "purely political," but ethical.

Read More