Like a fusion reactor can be used as a neutron source to effectively make a breeder reactor.
However, most countries can dig up rocks out of the ground with radioactive isotopes that can act as a neutron source. However, this has legitimate uses as well from research to medical imagining. Also any power generating reactor is gonna want to use those neutrons to make Tritium otherwise it would quickly run out fuel so not something you just want use on something unrelated to running the fusion reactor.
However, most countries can dig up rocks out of the ground with radioactive isotopes that can act as a neutron source. However, this has legitimate uses as well from research to medical imagining. Also any power generating reactor is gonna want to use those neutrons to make Tritium otherwise it would quickly run out fuel so not something you just want use on something unrelated to running the fusion reactor.