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North Korean leader Kim Jong Un operated a newly developed battle tank as he renewed calls for his military to prepare for war, state media reported Thursday.

Kim expressed "great satisfaction" with "the world’s most powerful" tank, which he drove himself during a "training match" that explored the combat capabilities of tank crews, according to Reuters. 

Kim’s participation added "to the high militant spirit of the tankmen of our army," the Korean Central News Agency reported.

The tank training came after South Korea and the U.S. military ended their annual 11-day joint drills which took place near the border with North and South Korea, per KCNA. The North has condemned these drills as a rehearsal for invasion and North Korea's Defense Ministry vowed to carry out "responsible military activities" in response. 

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Kim, soldiers, tanks

North Korean leader Kim Jong Un salutes as he guides a military demonstration involving tank units on Wednesday. (KCNA via REUTERS)

During the training exercises, heavy tanks moved through simulated harsh combat circumstances and fired live rounds.

"Swiftly weaving their way through various worst combat circumstances, heavy tanks hit targets at once with powerful strikes and broke through strong defense lines with high maneuverability," KCNA reported.

Tank firing a live round

The training exercises involved heavy tanks moving through simulated harsh combat circumstances and firing live rounds. (KCNA via REUTERS)

Several tanks in a row

The North’s Defense Minister Kang Sun Nam also attended the tank training. (KCNA via REUTERS)

The North’s Defense Minister Kang Sun Nam also attended the event, per Reuters.

The North Korean government did not provide the name or specifications of the battle tank driven by Kim.

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Kim's appearance comes after he led artillery firing drills for the Korean People's Army – the country's military force – last week.

A photo of a tank

The Korean Central News Agency released a picture on Thursday of North Korean leader Kim Jong Un sitting inside a tank during a military demonstration on Wednesday. (KCNA via REUTERS)

Kim, dozens of soldiers posing for a picture

North Korean leader Kim Jong Un poses with a tank and members of the Korean People's Army during a military demonstration on Wednesday. (KCNA via REUTERS)

The South Korea-U.S. military exercises involved a computer-simulated command program and included 48 types of field exercises.

North Korea remains particularly hostile as Kim continues to ramp up his weapon supplies and pursues advanced ballistic and nuclear technologies. 

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U.S. Secretary of State Antony Blinken will visit South Korea next week, where he will hold a meeting with South Korean foreign minister Cho Tae-yul in Seoul.

Several tanks firing weapons

North Korea's military exercises took place hours after the U.S. and South Korea ended 11 days of joint military drills. (KCNA via REUTERS)

Kim now joins Russian President Vladimir Putin in operating a military vehicle after Putin took a flight on a nuclear-capable bomber last month.

Putin rode the Tu-160M bomber, codenamed "Blackjacks" by NATO – a bomber capable of carrying 12 cruise missiles and flying approximately 7,500 miles without refueling – on Feb. 22.

The Associated Press contributed to this report.