The Japanese government has placed its military on high alert after signs of a possible North Korea attack.

The warning comes as Uganda, a strong African ally to North Korea, has grown closer to South Korea and cut ties to the north.

ABC News reported:

Patriot Advanced Capability-3 surface-to-air guided interceptors in central Tokyo were readied as a response to Nakatani’s order, and surveillance activities were also stepped up.

A separate government source today told Kyodo News that the Japanese have received indications that Pyongyang is preparing to launch a ballistic missile, possibly an intermediate-range Musudan missile, in the eastern part of North Korea facing the Sea of Japan.

A South Korean official also said they have taken precautions in case of a launch.

Despite the threat, South Korea scored a major victory over North Korea when they lured Uganda to their side. South Korean President Park Geun-hye visited the African country where President Yoweri Museveni vowed to “sever all police and military ties” to the communist government:

“The directive takes immediate effect and is aimed at ensuring that Uganda complies with the U.N. resolution on North Korea,” he said.

In March, the UN Security Council voted to place more sanctions on North Korea over nuclear tests and missile launches, which violated international sanctions. The latest sanctions ban all weapons deals and military-training contracts with North Korea.

South Korea has taken advantage of the punishments:

Uganda’s foreign ministry said 10 cooperation agreements were signed in areas including military, rural development, health, agriculture and information and communications technology.

Under the defense pact, Uganda and South Korea will “expand cooperation in the area of military technology and training” to help “fill the void created by the disengagement of defense and police cooperation with North Korea,” a ministry spokesman said.

Uganda security officials say North Korean instructors have been training Ugandan police in areas including forensic investigations, public-order management and handling of weapons such as pistols and AK-47s.