Как из одного роутера перейти в другой роутер(aiogram)?

/App/handlers.py

from aiogram import Router
from aiogram.filters import CommandStart
from aiogram.types import Message

from app.KeyBoard.button import create_inlineKeyBoard

router = Router()


@router.message(CommandStart())
async def cmd_start(msg: Message):
    await msg.answer("Добро пожаловать!"
                     "Выберите меню:", reply_markup=create_inlineKeyBoard())

/App/admin.py

from aiogram import Router
from aiogram.filters import CommandStart
from aiogram.types import Message

from app.KeyBoard.button import create_inlineKeyBoard

router = Router()

@router.callback_query()
async def admin_panel(cb: CallbackQuery):
    if cb.from_user.id == id_admin: