I am loving it apart from the stance on china and russia.

For clarity, they have the consensus stance among Marxists, which is in line with the rest of their platform as Marxist-Leninists.

The is U.S. is at peace with russia and china.

Not quite. The U.S. is constantly hostile to Russia ever since it threw off the Western financial monopolists who looted the USSR's former state assets, and the US has become increasingly hostile with China ever since it became increasingly clear that China was never going to become a free-market paradise for the West to loot like they did the Russian Federation, to the point of preparing for war with the PRC by 2027.

In the meanwhile the two countries eye their neighbours in order to seize up as much land as they can

That's certainly the western view the media would have you believe, though it's worth noting that China especially has been incredibly peaceful since its founding, while the US has been at near constant war. It's largely projection and manufacturing consent for said war with China.

Russia already started seizing land of a sovereign nation. Or do these people believe that russia is "anti-capitalist"?

Russia is 100% a right-wing Capitalist nightmare, but in throwing off predatory Western Finance it is more nationalist, and stands against Imperialism as Marxists understand it (specifically a form of international monopolist Capitalism based on extraction).

Do not get me wrong, i am also in favor of cutting military budget but this is something that needs to happen globally or will simply mean that some countries are free to bully others (which, fair enough, the U.S. tended to do a lot).

The US is the number 1 bully because it is the largest Imperialist power in the world, hence the current genocide in Palestine through its vassel Israel.