Ukraine, the United States, Poland and Lithuania will hold a large military exercise in the western part of Ukraine later in July, the Ukrainian military said on Monday.

The drill, Three Swords-2021, will involve more 1,200 servicemen and more than 200 combat vehicles and will last from 17 to 30 July at Yavoriv training ground in Lviv region.

"Three Swords-2021 create favourable conditions for the development and effective coordination of units of partner states, in order to improve the quality and increase the level of combat capabilities," the military said in a statement, Reuters reported.

Last week, Ukraine and the United States started a military exercise, Sea Breeze, involving more than 30 countries in the Black Sea and southern Ukraine, despite Russian calls to cancel the drills.