President Donald Trump said he’ll announce his administration’s largest U.S. sanctions package yet against North Korea on Friday.

The sanctions, which Trump plans to unveil at a meeting of conservatives near Washington, aims to disrupt North Korean shipping and trading companies and vessels to further isolate the regime of Kim Jong Un.

“The Treasury Department will soon be taking new action to further cut off sources of revenue and fuel that the regime uses to fund its nuclear program and sustain its military by targeting 56 vessels, shipping companies, and trade businesses that are assisting North Korea in evading sanctions,” Trump will tell the meeting, according to excerpts released in advance by the White House.

North Korea already faces the most severe sanctions imposed by the U.S. The additional sanctions follow a year of escalating tensions between the U.S. and North Korea over its ballistic missile testing and nuclear development programs.

Vice President Mike Pence hinted at the new sanctions earlier this month during an Asia trip, promising the administration would bring “maximum pressure” to bear on the Kim government.