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@bot.message_handler(commands=['start'])
def start(message):
    markup = telebot.types.ReplyKeyboardMarkup(resize_keyboard=True)
    btn1 = telebot.types.KeyboardButton("RU Русский")
    btn2 = telebot.types.KeyboardButton('EN English')
    markup.add(btn1, btn2)
    bot.send_message(message.from_user.id, 
                     "RU Выберите язык / EN Choose your language", 
                     reply_markup=markup)